CN107172074B - Information sending method, processing method and device - Google Patents
Information sending method, processing method and device Download PDFInfo
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- CN107172074B CN107172074B CN201710494820.4A CN201710494820A CN107172074B CN 107172074 B CN107172074 B CN 107172074B CN 201710494820 A CN201710494820 A CN 201710494820A CN 107172074 B CN107172074 B CN 107172074B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q20/00—Payment architectures, schemes or protocols
- G06Q20/08—Payment architectures
- G06Q20/10—Payment architectures specially adapted for electronic funds transfer [EFT] systems; specially adapted for home banking systems
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q20/00—Payment architectures, schemes or protocols
- G06Q20/38—Payment protocols; Details thereof
- G06Q20/382—Payment protocols; Details thereof insuring higher security of transaction
- G06Q20/3829—Payment protocols; Details thereof insuring higher security of transaction involving key management
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q20/00—Payment architectures, schemes or protocols
- G06Q20/38—Payment protocols; Details thereof
- G06Q20/40—Authorisation, e.g. identification of payer or payee, verification of customer or shop credentials; Review and approval of payers, e.g. check credit lines or negative lists
- G06Q20/401—Transaction verification
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0407—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the identity of one or more communicating identities is hidden
- H04L63/0421—Anonymous communication, i.e. the party's identifiers are hidden from the other party or parties, e.g. using an anonymizer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/12—Applying verification of the received information
- H04L63/126—Applying verification of the received information the source of the received data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
- H04L9/3247—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving digital signatures
- H04L9/3249—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials involving digital signatures using RSA or related signature schemes, e.g. Rabin scheme
Abstract
The invention discloses an information sending method, an information processing method and an information sending device, which are used for improving the anonymity of anonymous communication and comprise the following steps: receiving information to be transmitted and a transmission target input by a user; acquiring an encryption key of a transmission target, and encrypting information to be transmitted by using the encryption key; taking the encrypted information to be transmitted as an additional information parameter of the first transaction information; the transaction target of the first transaction information is different from the transmission target; the commission charge parameter of the first transaction information is set to be a first specific value, and the first specific value is used for indicating an accounting node in the blockchain system not to record the first transaction information; the first transaction information is sent through the blockchain system. The attacker cannot acquire the real identity of the user of the transmission target. Moreover, the commission parameters of the first transaction information are set to the first specific value so as to prevent the first transaction information from being written into the public ledger of the block chain system by the accounting node, and the risk that an attacker maliciously screens the transaction information through the public ledger is also avoided.
Description
Technical Field
The invention relates to the technical field of internet, in particular to an information sending method, an information processing method and an information sending device.
Background
Anonymous communication is in wide demand in internet applications, such as electronic voting, internet banking, electronic securities trading, and electronic commerce. Users want to protect the identity information of communication users during data transmission, and prevent attackers from monitoring and analyzing communication data. In the conventional Internet, each user has a unique Internet Protocol (IP) address when using a network service, and each transmission packet includes a data source IP address and a destination IP address. An attacker can discover a sender and a receiver corresponding to a message by monitoring and analyzing the transmission message in the network, so that anonymous communication is difficult to realize.
The existing anonymous communication mechanism mainly includes anonymous communication of an onion (tor) Network, encrypted anonymous communication of a Virtual Private Network (VPN), anonymous communication of a bit message (bitmap), and the like. For anonymous communication of a network tor, anonymity is positively correlated with the number of onion nodes, so that a large-scale infrastructure needs to be maintained, the network tor is extremely vulnerable to malicious nodes, and when any node in the network tor is a malicious node constructed by an attacker, an information transmission path of the network tor and anonymity of information transmission can be threatened. The encrypted anonymous VPN communication has similar problems in the network of the recipient, which also needs extra VPN infrastructure, and when the user pays the VPN service fee, the identity information is easy to be leaked, and in addition, the provider of the VPN service has the risk of being managed. For the anonymous communication of the bit message, a Peer-to-Peer network (Peer-to-Peer, P2P) for communication needs to be specially constructed, and communication among nodes is performed according to node addresses in the P2P network, although the anonymous communication of the bit message can ensure the anonymity of communication by using the "anonymity" of the node addresses in the P2P network, a great deal of research has been carried out at present to prove that the anonymity of the node addresses in the P2P network has defects, and a plurality of methods can be used for peeking the node addresses to be associated with the real identities of users.
In summary, the conventional anonymous information communication methods have a problem of insufficient anonymity.
Disclosure of Invention
The invention provides an information sending method, an information processing method and an information sending device, which are used for improving the anonymity of anonymous information communication.
The embodiment of the invention provides an information sending method, which comprises the following steps:
receiving information to be transmitted and a transmission target input by a user;
acquiring an encryption key of the transmission target, and encrypting the information to be transmitted by using the encryption key;
taking the encrypted information to be transmitted as an additional information parameter of the first transaction information; the transaction target of the first transaction information is different from the transmission target; the commission charge parameter of the first transaction information is set to a first specific value, and the first specific value is used for indicating that a billing node in a blockchain system does not record the first transaction information;
and sending the first transaction information through the blockchain system.
Optionally, after the first transaction information is sent by the blockchain system, the method further includes:
and when a response message sent by the transmission target is received within a preset time interval, confirming that the first transaction information is successfully sent.
Optionally, the method further includes:
when the response message sent by the transmission target is not received within a preset time interval, the second transaction information is sent again; the additional information parameter of the second transaction information is encrypted information to be transmitted; the commission parameter of the second transaction information is a second specific value, and the second specific value is used for indicating an accounting node in the blockchain system to record the second transaction information.
Optionally, after the encrypted information to be transmitted is used as an additional information parameter of the transaction information, the method further includes:
generating a public and private key pair;
signing the first transaction information with a private key of the public-private key pair; the signed first transaction information comprises public key information in the public and private key pair.
The embodiment of the invention provides an information processing method, which comprises the following steps:
the transmission node receives transaction information transmitted by the blockchain system; the transaction target of the transaction information is different from the transmission target; the additional information parameter of the transaction information is to-be-transmitted information encrypted by using the encryption key of the transmission target; the commission parameter of the transaction information is a first specific value, and the first specific value is used for indicating that a billing node in the blockchain system does not record the first transaction information;
and the transmission node decrypts the additional information parameter in the first transaction information by using the own key, and extracts the information content in the additional information parameter when the decryption is successful.
Optionally, after extracting the information content in the additional information parameter when the decryption is successful, the method further includes:
constructing third transaction information; the additional information parameter of the third transaction information is a response message encrypted according to an encryption key of a sender sending the first transaction information;
sending the third transaction information to the blockchain system.
Optionally, the method further includes:
the transmission node extracts a second transaction information record of an account book of each node in the block chain system;
and the transmission node decrypts the additional information parameter in the second transaction information by using the own key, and extracts the information content in the additional information parameter when the decryption is successful.
Optionally, before the transmitting node uses its own key to decrypt the additional information parameter in the first transaction information, the method further includes:
acquiring public key information in the first transaction information; the public key is a public key in a public and private key pair generated by the sender;
verifying the signature of the first transaction information according to the public key;
and when the verification is passed, decrypting the additional information parameter in the first transaction information by using the self-secret key.
Optionally, the method further includes:
and when the decryption is not successful, continuing to forward the first transaction information.
An embodiment of the present invention provides an information sending apparatus, including:
the receiving and sending unit is used for receiving information to be transmitted and a transmission target input by a user;
the processing unit is used for acquiring an encryption key of the transmission target and encrypting the information to be transmitted by using the encryption key;
the processing unit is also used for taking the encrypted information to be transmitted as an additional information parameter of the first transaction information; the transaction target of the first transaction information is different from the transmission target; the commission charge parameter of the first transaction information is set to a first specific value, and the first specific value is used for indicating that a billing node in a blockchain system does not record the first transaction information;
the transceiver unit is further configured to send the first transaction information through the blockchain system.
Optionally, the processing unit is further configured to:
and when a response message sent by the transmission target is received within a preset time interval, confirming that the first transaction information is successfully sent.
Optionally, the processing unit is further configured to:
when the response message sent by the transmission target is not received within a preset time interval, the second transaction information is sent again; the additional information parameter of the second transaction information is encrypted information to be transmitted; the commission parameter of the second transaction information is a second specific value, and the second specific value is used for indicating an accounting node in the blockchain system to record the second transaction information.
Optionally, the processing unit is further configured to:
generating a public and private key pair;
signing the first transaction information with a private key of the public-private key pair; the signed first transaction information comprises public key information in the public and private key pair.
An embodiment of the present invention provides an information processing apparatus, including:
the receiving and sending unit is used for receiving the transaction information transmitted by the block chain system; the transaction target of the transaction information is different from the transmission target; the additional information parameter of the transaction information is to-be-transmitted information encrypted by using the encryption key of the transmission target; the commission parameter of the transaction information is a first specific value, and the first specific value is used for indicating that a billing node in the blockchain system does not record the first transaction information;
the processing unit is used for decrypting the additional information parameter in the first transaction information by using the self key, and extracting the information content in the additional information parameter when the decryption is successful;
the processing unit is further configured to, when the node is an accounting node, if the specific value is a first specific value, not record the transaction information.
Optionally, the processing unit is further configured to:
constructing third transaction information; the additional information parameter of the third transaction information is a response message encrypted according to an encryption key of a sender sending the first transaction information;
sending the third transaction information to the blockchain system.
Optionally, the processing unit is further configured to:
extracting a second transaction information record of an account book of each node in the block chain system;
and decrypting the additional information parameter in the second transaction information by using the self key, and extracting the information content in the additional information parameter when the decryption is successful.
Optionally, the processing unit is further configured to:
acquiring public key information in the first transaction information; the public key is a public key in a public and private key pair generated by the sender;
verifying the signature of the first transaction information according to the public key;
and when the verification is passed, decrypting the additional information parameter in the first transaction information by using the self-secret key.
Optionally, the processing unit is further configured to:
and when the decryption is not successful, controlling the transceiver unit to continuously forward the first transaction information.
The transaction target of the first transaction information is different from the transmission target, so that even if an attacker can crack the association relation between the node address and the user real identity in the blockchain system, only the user real identity of the transaction target can be obtained, but the user real identity of the transmission target cannot be obtained. In addition, the first transaction information in the embodiment of the present invention does not include address information of the transmission target, and the transmission node determines whether to extract information content in the additional parameter information by whether to decrypt successfully, instead of determining whether to extract information content in the additional parameter information by means of identifying the transmission address, so that even if the first transaction information does not include address information of the transmission target, the transmission target can be ensured to successfully receive the to-be-transmitted information carried in the first transaction information. In addition, the commission parameters of the first transaction information are set to the first specific values so as to prevent the first transaction information from being written into the public account book of the block chain system by the accounting node, and the risk that an attacker maliciously screens the transaction information through the public account book is also avoided. Therefore, the technical scheme disclosed by the embodiment of the invention can enhance the anonymity of anonymous communication.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic diagram of a bitcoin network system according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of an information sending method according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of an information processing method according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an information sending process according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of an information processing flow according to an embodiment of the present invention;
fig. 6 is a schematic diagram of an information sending process according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a transmitting apparatus according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an information processing apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme provided by the embodiment of the invention is suitable for most of block chain systems, wherein the block chain system is a centerless network system, and the most common block chain system is a bitcoin network system. Fig. 1 is a schematic diagram of a bitcoin network system architecture according to an embodiment of the present invention, where fig. 1 simply illustrates the system architecture of the bitcoin network, and the bitcoin network system architecture in practical applications is much more complex than that shown in fig. 1. As shown in fig. 1, the bitcoin network system is composed of a plurality of terminals, in which there is no central server or device with similar functions, and each terminal in the system is "equal" and can construct, transmit and receive transaction information. If a terminal wants to join the bitcoin network, specific bitcoin software needs to be installed in the terminal, and when the bitcoin software runs, the terminal joins the bitcoin network. The terminal has a unique address in the bit coin network system, the address can be generated by bit coin software after a string of characters is input by a user, and when the bit coin transaction is carried out between the terminals, the transaction information is portable with the address information of a transaction target. According to the address information of the transaction target, the bitcoin network system adopts a relay forwarding mode to transmit the transaction information, namely after one system node receives one transaction information, whether the transaction information is the address information of the bitcoin network system is judged according to the address information of the transaction target in the transaction information, and if not, the transaction information is broadcasted to the adjacent system node. The bitcoin network system is only a common block chain system, and other digital currency systems such as etherhouses have similar principles and characteristics except the bitcoin network system, and are also included in the embodiments of the present invention.
Based on the above block chain system architecture taking the bitcoin network system as an example, an embodiment of the present invention provides an information sending method. Fig. 2 is a schematic flow chart of an information sending method according to an embodiment of the present invention, as shown in fig. 2, including the following steps:
s201: and receiving the information to be transmitted and the transmission target input by the user.
S202: and acquiring an encryption key of the transmission target, and encrypting the information to be transmitted by using the encryption key.
S203: taking the encrypted information to be transmitted as an additional information parameter of the first transaction information; the transaction target of the first transaction information is different from the transmission target; the commission parameter of the first transaction information is set to a first specific value, and the first specific value is used for indicating that the accounting node in the blockchain system does not record the first transaction information.
S204: the first transaction information is sent through the blockchain system.
In a specific implementation process, the blockchain system may be a bitcoin network system, an ethernet network system, a blockchain system specially constructed for anonymous transmission, or the like, which is not limited in the embodiment of the present invention. Optionally, the block chain system is a bit currency network system, and the bit currency network system is the block chain system which is widest in coverage area, most mature in development and most stable in operation at present. When the transaction information is transmitted in the blockchain system, the system node generating the transaction information is the sender, any system node which is not the sender can be used as the transmission node of the transaction information, and the transmission target is one of a plurality of transmission nodes of the transaction information.
In S201, the information to be transmitted is information that the user intends to anonymously transmit to the transmission destination. For example, the user a intends to notify the user B of "meeting at the park entrance at 4 pm tomorrow", the system node corresponding to the user a is the sender, the information to be transmitted is "meeting at the park entrance at 4 pm tomorrow", and the system node corresponding to the user B is the transmission target that needs to receive the information to be transmitted.
In S202, the encryption key of the transmission destination may be obtained by the sending party through offline or other communication paths, so as to ensure that the encryption key is not known to the third party. The encryption key may be a private key agreed by the sender and the transmission destination in advance, and both encryption and decryption are performed by using the private key, or may be an encryption key in a key pair agreed by the sender and the transmission destination, or may be a public key address of the transmission destination, where the public key address is equivalent to a system node address in the blockchain system and is an identity of a user in the blockchain system, and the system node generates a public key address and a private key corresponding to the public key address by using blockchain software (e.g., bitcoin software in a bitcoin network system), and the public and private key pair is generally used for purposes of identity authentication, digital signature, and the like in the blockchain system.
In S203, additional information parameters are set in the transaction information of the blockchain system, and are generally used to record information such as transaction time, transaction origin, and the like. For example, in the bitcoin network system, the additional information parameter is an OP _ RETURN parameter, and when the transaction information is constructed, the encrypted information to be transmitted needs to be recorded in the OP _ RETURN parameter. It should be noted that the transaction destination of the transaction information is different from the transmission destination, for example, if the user a transmits a message to the user B, the transmission destination of the transaction information is the user B, and the transaction destination of the transaction information is the user C. Optionally, the transaction address information in the transaction information may be set as the address information of the user C, and any transaction address information may also be input at will, because the purpose of the transaction information is to implement message transmission from the user a to the user B, and it is not necessary to ensure that the transaction information will certainly implement a transaction process between the user a and another user. Of course, the method of hiding the message directly transmitted from the user a to the user B in the normal transaction information between the user D and the user C or between the user a and the user C is also included in the embodiment of the present invention, and the detailed description thereof is omitted here.
In a blockchain system, particularly a blockchain digital currency system, a public account book for recording all transaction information in the system exists, the account book is formed by combining account books of all system nodes, and any person can read additional information parameters in the transaction information recorded by the public account book. Although the additional information parameter of the first transaction information in the embodiment of the invention is the to-be-transmitted information encrypted by the transmission target encryption key, and an attacker cannot decrypt the to-be-transmitted information, the attacker still can carry out malicious screening on the transaction information in the public ledger according to certain characteristics of the additional information parameter, so that the anonymity of communication is reduced to a certain extent. Therefore, in S203, the commission parameter of the first transaction information is set to a first specific value, and the first specific value is used for indicating that the accounting node in the blockchain system does not record the first transaction information. In the blockchain system, in order to ensure the consistency of the accounts of each system node, one system node is selected as an accounting node through a blockchain protocol, the node records the transaction information in a public account book, and then the accounting node sends out a broadcast to inform other nodes in the system to record the transaction information in respective account books and charge a certain commission charge. Only after the transaction information is recorded in the public ledger is the transaction information considered to be valid. Generally, the accounting node processes the transaction information in the order of the high and low commission fees, that is, the transaction information with higher commission parameters is processed earlier and the transaction information with lower commission parameters is processed later, and when the transaction information is not recorded in the public ledger by the accounting node within a certain period of time, the transaction information is considered invalid. In the embodiment of the invention, the commission charge parameter is set to a first specific value, such as 0, namely the commission charge or other lower numerical values are not paid, or illegal fields in any forms are set, so that the accounting node does not process the first transaction information for a long time until the first transaction information is invalid, and the first transaction information is prevented from being written into a public ledger. Of course, the failure of the first transaction message does not mean that the other nodes in the system are no longer transmitting the transaction message, and the transaction message is still transmitted to the transmission destination through the blockchain system.
In S204, the sender sends the transaction information to the blockchain system, specifically, sends the transaction information to the neighboring system node in a broadcast manner, and when the neighboring system node is not a transmission target, the neighboring system node continues to perform broadcast forwarding, that is, relay forwarding. Since the blockchain system uses the relay forwarding mode to transmit information, almost all system nodes in the blockchain system will receive the transaction information.
Corresponding to the information sending method, the embodiment of the invention also provides an information processing method. Fig. 3 is a schematic flow chart of an information processing method according to an embodiment of the present invention, as shown in fig. 3, including the following steps:
s301: the transmission node receives transaction information transmitted by the blockchain system; the transaction target of the transaction information is different from the transmission target; the additional information parameter of the transaction information is to-be-transmitted information encrypted by using an encryption key of a transmission target; the commission parameter of the transaction information is a first specific value, and the first specific value is used for indicating that the accounting node in the blockchain system does not record the transaction information.
S302: and the transmission node decrypts the additional information parameter in the first transaction information by using the self key, and extracts the information content in the additional information parameter when the decryption is successful.
S303: and when the transmission node is the accounting node, if the specific value is the first specific value, the transaction information is not recorded.
It should be understood that a transmitting node is any node in the blockchain system that is not a sender, and can be a transmission target or a normal system node that is not a transmission target.
At S301, a transmitting node receives a plurality of transaction messages, some of which are sent to the transmitting node and some of which are not sent to the transmitting node. Different from the prior art, the transaction target of the transaction information is different from the transmission target, and the additional information parameter of the transaction information is to-be-transmitted information encrypted by using the encryption key of the transmission target.
In S302, after receiving the transaction information, the transmission node determines whether it is a transmission target for receiving the information to be transmitted in the transaction information, in addition to determining whether it is a transaction target in the transaction information. In the transaction information provided by the embodiment of the invention, the additional information parameter carries the information to be transmitted, and after receiving the transaction information, if the transmission node needs to judge whether the transmission node is a transmission target of the transaction information, the additional information parameter in the transaction information needs to be decrypted by adopting a decryption key. The decryption key is a decryption key corresponding to the encryption key used in encrypting the information to be transmitted in S202. Optionally, the transmission node may determine the sender information according to the sender public key address information carried in the transaction information, and further determine a decryption key of the encryption key corresponding to the sender.
After the additional information parameter is decrypted, a decryption result can be obtained, and optionally, whether the additional information parameter is decrypted successfully or not can be judged according to a preset standard. For example, the successful decryption result has certain characteristics, such as that the 3 bits are 111, or the decryption result is an alphanumeric cross combination, or the successful decryption result is a sequence of a fixed length, or the decryption result includes a predetermined key value, and so on. Of course, different judgment criteria may need to correspondingly add certain information in the additional information parameter when the sender constructs the transaction information, which is not described in detail in the embodiment of the present invention. And when the decryption is successful, extracting the information content in the decryption result, namely the information to be transmitted. Optionally, when the decryption is not successful, it indicates that the transmission node is not the transmission target of the transaction information, and in this case, the transaction information is broadcasted to the neighboring transmission nodes in a broadcast manner.
It should be understood that the transmitting node could be a billing node of the blockchain system. Therefore, in S303, if the transmission node is an accounting node, the position of the first transaction information in the processing queue is determined according to the specific value in the first transaction information, and since the specific value in the first transaction information is the first specific value in the embodiment of the present invention, the accounting node will place the first transaction information at the end of the processing queue, and after a certain time, the first transaction information that is not processed by the accounting node is invalidated, so that the first transaction information is not recorded.
In the above embodiment, the transaction target of the first transaction information is different from the transmission target, so that even if an attacker can break the association between the node address and the user real identity in the blockchain system, only the user real identity of the transaction target can be obtained, but the user real identity of the transmission target cannot be obtained. In addition, the first transaction information in the embodiment of the present invention does not include address information of the transmission target, and the transmission node determines whether to extract information content in the additional parameter information by whether to decrypt successfully, instead of determining whether to extract information content in the additional parameter information by means of identifying the transmission address, so that even if the first transaction information does not include address information of the transmission target, the transmission target can be ensured to successfully receive the to-be-transmitted information carried in the first transaction information. In addition, the commission parameters of the first transaction information are set to the first specific values so as to prevent the first transaction information from being written into the public account book of the block chain system by the accounting node, and the risk that an attacker maliciously screens the transaction information through the public account book is also avoided. Therefore, the technical scheme disclosed by the embodiment of the invention can enhance the anonymity of anonymous communication.
In addition, the first transaction information does not need to be recorded in a public ledger, and the commission charge does not need to be paid to the accounting node, so that the technical scheme provided by the embodiment of the invention has lower cost.
In the anonymous communication process, if the same pair of encryption key and decryption key is always adopted, the risk of being cracked exists. Optionally, each time the transaction information is transmitted, the current encryption key is updated according to the preset rule, and the information to be transmitted is encrypted by using the updated encryption key. For example, if the current encryption key is a, and the preset rule is "add 2 on the basis of the current encryption key", the updated encryption key is a +2, and after the transaction information is transmitted once, when the transaction information is transmitted again, the current encryption key is a +2, and the current encryption key is updated according to the preset rule, so that the updated encryption key is a + 4. Accordingly, the decryption key also needs to be updated synchronously. For example, if a preset rule 1 exists between the system node a and the system node B, the system node a successfully decrypts by using the decryption key 1 after receiving the to-be-transmitted information which is sent by the system node B and encrypted according to the encryption key 1, and extracts the to-be-transmitted information; and then, updating the decryption key 1 according to a preset rule 1 to obtain a decryption key 2, updating the encryption key 1 by the system node B when the system node B sends information to the system node A again to obtain an encryption key 2, encrypting the information to be transmitted by using the encryption key 2, and then decrypting the information to be transmitted by using the decryption key 2 after the system node A receives the information to be transmitted which is sent by the system node B and encrypted according to the encryption key 2 again. The dynamically updated encryption and decryption keys may reduce the risk of being cracked, thereby improving the anonymity of communications.
In the block chain system, because the number of system nodes is large, the problem that illegal system nodes forge transaction information exists. Optionally, after S203, the method further includes: generating a public and private key pair; utilizing a private key in a public and private key pair to sign transaction information; the signed transaction information contains public key information in a public and private key pair. In a specific implementation process, the public and private key pair can be generated by a sender according to a block chain protocol. Correspondingly, before S302, the method further includes: acquiring public key information in the transaction information; the public key is a public key in a public and private key pair generated by the sender; verifying the signature of the transaction information according to the public key; and when the verification is passed, the additional information parameter in the transaction information is decrypted. In the block chain system, the private key of the system node is only known by the system node, after the private key is used for signing the transaction information, when the public key is used for verification, the transaction information is determined to be from the system node corresponding to the public key information, and because the public key information does not correspond to the private key information, the verification cannot be passed, the difficulty of counterfeiting the transaction information by an illegal system node is greatly improved, and the security of the system is improved.
In the embodiment of the invention, the first transaction information is prevented from being written into the public ledger by setting the commission parameter of the first transaction information to the first specific value, so that the anonymity of communication is improved. However, this embodiment can be implemented on the premise that the transmission target is in a state capable of receiving the first transaction information, such as an online state. In the above embodiment, after the sender sends the first transaction information, the sender cannot know whether the first transaction information is received by the target to be transmitted, which is not beneficial to the transmission of important information. Optionally, after the transmission target successfully decrypts and extracts the information content in the additional information parameter, the method further includes: constructing third transaction information; the additional information parameter of the third transaction information is a response message encrypted according to an encryption key of a sender sending the first transaction information; and sending the third transaction information to the blockchain system. The process of constructing the third transaction information is similar to the first transaction information except that the additional information parameter is different. The additional information parameter of the third transaction information is a corresponding message encrypted by an encryption key of the sender of the first transaction information, and the corresponding message may specifically be "1", may be "received", may have other agreed specific message forms, may also be a reply directly to the information to be transmitted in the first transaction information, and the like. And for the sender of the first transaction information, after sending the first transaction information through the blockchain system, the method further comprises the following steps: and when a response message sent by the transmission target is received within a preset time interval, confirming that the first transaction information is successfully sent. Specifically, the receiving party decrypts the received transaction information by using the decryption key of the receiving party, and extracts the information content, namely the corresponding message, in the additional information parameter of the transaction information when the decryption is successful. By specifying the form that the transmission target returns the corresponding message to the sender of the first transaction information, the sender of the first transaction information can know whether the first transaction information is successfully received by the transmission target, and the reliability of anonymous communication is improved.
When the sender of the first transaction information does not receive the response message sent by the transmission target within the preset time interval, it indicates that the transmission target is in a state that the first transaction information cannot be received, such as offline, at this time, optionally, the sender resends the second transaction information; the additional information parameter of the second transaction information is encrypted information to be transmitted; the commission parameter of the second transaction information is a second specific value, and the second specific value is used for indicating an accounting node in the blockchain system to record the second transaction information. The second transaction information is constructed in a similar manner to the first transaction information, except that the commission parameter of the second transaction information is a second specific value, such as a higher value or a normal value. When the accounting node receives the second transaction information, the processing sequence of the second transaction information is determined according to the commission charge parameter, and the second transaction information is preferentially or normally recorded in the public ledger by the accounting node because the second specific value is a higher value or a normal value. When the transmission target recovers the state of being capable of receiving the transaction information, if the blockchain system is logged in, optionally extracting a second transaction information record of the account book of each node in the blockchain system; and the transmission node decrypts the additional information parameter in the second transaction information by using the self key, and extracts the information content in the additional information parameter when the decryption is successful. The ledger of each node in the blockchain system is the public ledger of the blockchain system. Specifically, at the system node side, when a system node logs in the blockchain system, the transaction information recorded in the public ledger is traversed. Optionally, only the transaction information in a certain range of the public ledger is traversed, for example, only the transaction information recorded in the public ledger during offline is traversed in the time dimension. Through the embodiment, even if the transmission target is in the state of being incapable of receiving the first transaction information, the second transaction information can be established, and recorded in the public ledger, so that the transmission target can acquire the second transaction information from the public ledger when replying the state of being capable of receiving the first transaction information, thereby avoiding the loss of the information to be transmitted and improving the reliability of the anonymous communication system.
In order to further explain the technical solutions provided by the embodiments of the present invention, the embodiments of the present invention further provide the following two possible implementation manners. It should be understood that the following two possible implementations are merely provided to illustrate the technical solutions provided by the embodiments of the present invention, and do not represent that the embodiments of the present invention only include or only apply to the following two cases.
First possible implementation
Fig. 4 is a schematic diagram of an information sending process according to an embodiment of the present invention, as shown in fig. 4, including the following steps:
s401: receiving information to be transmitted and a transmission target.
S402: and obtaining the public key information of the target to be transmitted.
S403: the information to be transmitted is encrypted.
S404: and constructing first transaction information, taking the encrypted information to be transmitted as an additional information parameter of the first transaction information, wherein the transaction target of the first transaction information is different from the transmission target of the additional information parameter of the first transaction information, and the commission charge parameter of the first transaction information is set to be 0.
S405: and generating a public and private key pair according to the block chain protocol.
S406: the first transaction information is signed with a private key of a public-private key pair.
S407: and sending the signed first transaction information to the blockchain system.
Fig. 5 is a schematic diagram of an information processing flow according to an embodiment of the present invention, as shown in fig. 5, including the following steps:
s501: transaction information transmitted from the blockchain system is received.
S502: the signature in the transaction message is verified.
S503: if the signature verification passes, executing S504, otherwise, executing S507.
S504: the additional information parameter in the transaction information is decrypted.
S505: if the decryption is successful, S506 is executed, otherwise, S508 is executed.
S506: the information content in the additional information parameter is extracted.
S507: the transaction information is discarded.
S508: the transaction information is broadcast to neighboring nodes.
In the first possible implementation manner, the transaction target of the first transaction information is different from the transmission target, and an attacker cannot acquire any information of the transmission target from the first transaction information, so that the anonymity of communication is improved. The commission parameter is set to 0 so that the first transaction information will not be recorded in the public ledger, thereby further improving the anonymity of the communication. In addition, the sender signs the first transaction information by using the private key, the receiver only processes the first transaction information after the signature verification is passed, and the first transaction information which does not pass the signature verification is directly discarded, so that the difficulty of an attacker forging the first transaction information is improved, and the safety of the system is improved.
Second possible implementation
In a second possible implementation, a case is considered where the transmission target may not be able to receive the first transaction information. Fig. 6 is a schematic diagram of an information sending process according to an embodiment of the present invention, as shown in fig. 6, after S407 in fig. 4, the method further includes the following steps:
s601: judging whether a response message is received within a preset time; if yes, go to S602; if not, go to S603.
S602: and confirming that the first transaction information is successfully sent.
S603: second transaction information is constructed. And taking the encrypted information to be transmitted as the additional information parameter of the second transaction information, wherein the transaction target of the second transaction information is different from the transmission target of the additional information parameter of the second transaction information, and the commission charge parameter of the second transaction information is set to be a normal value.
S604: and sending the second transaction information to the blockchain system.
Optionally, after S603, the second transaction information may also be signed to enhance the security of the communication system, which is not described herein.
Correspondingly, after S506 in fig. 5, the following steps are further included:
the method comprises the following steps: an encryption key of a sender of the first transaction information is obtained.
Step two: the corresponding message is encrypted using the sender's encryption key.
Step three: and constructing third transaction information, taking the encrypted corresponding information as an additional information parameter of the third transaction information, wherein the transaction target of the third transaction information is different from the transmission target of the additional information parameter of the third transaction information, and the commission charge parameter of the third transaction information is set to be 0.
Step four: and sending the third transaction information to the blockchain network.
Optionally, after the third step, a public and private key pair may be generated, and the third transaction information may be signed to enhance the security of the communication system.
In the second possible implementation manner, the situation that the transmission target may not receive the first transaction information is considered. Compared with the first possible implementation mode, the second possible implementation mode can better ensure that important information can be received by a transmission target, and the reliability of the communication system is improved.
Based on the same technical concept, an information sending apparatus is further provided in the embodiment of the present invention, and fig. 7 is a schematic structural diagram of the sending apparatus provided in the embodiment of the present invention, as shown in fig. 7, the sending apparatus 700 includes: a transceiver unit 701 and a processing unit 702, wherein,
a transceiver unit 701, configured to receive information to be transmitted and a transmission target input by a user;
a processing unit 702, configured to obtain an encryption key of a transmission target, and encrypt information to be transmitted using the encryption key;
the processing unit 702 is further configured to use the encrypted information to be transmitted as an additional information parameter of the first transaction information; the transaction target of the first transaction information is different from the transmission target; the commission charge parameter of the first transaction information is set to be a first specific value, and the first specific value is used for indicating an accounting node in the blockchain system not to record the first transaction information;
the transceiver 701 is further configured to transmit the first transaction information through the blockchain system.
Optionally, the processing unit 702 is further configured to:
and when a response message sent by the transmission target is received within a preset time interval, confirming that the first transaction information is successfully sent.
Optionally, the processing unit 702 is further configured to:
when the response message sent by the transmission target is not received within the preset time interval, the second transaction information is sent again; the additional information parameter of the second transaction information is encrypted information to be transmitted; the commission parameter of the second transaction information is a second specific value, and the second specific value is used for indicating an accounting node in the blockchain system to record the second transaction information.
Optionally, the processing unit 702 is further configured to:
generating a public and private key pair;
signing the first transaction information by using a private key in a public and private key pair; the signed first transaction information contains public key information in a public and private key pair.
Based on the same technical concept, an information processing apparatus is further provided in an embodiment of the present invention, fig. 8 is a schematic structural diagram of an information processing apparatus provided in an embodiment of the present invention, and as shown in fig. 8, a processing apparatus 800 includes: a transceiving unit 801 and a processing unit 802, wherein,
a transceiver unit 801, configured to receive transaction information transmitted by a blockchain system; the transaction target of the transaction information is different from the transmission target; the additional information parameter of the transaction information is to-be-transmitted information encrypted by using an encryption key of a transmission target; the commission charge parameter of the transaction information is a first specific value, and the first specific value is used for indicating that the accounting node in the blockchain system does not record the first transaction information;
the processing unit 802 is configured to decrypt the additional information parameter in the first transaction information using the own key, and extract the information content in the additional information parameter when the decryption is successful;
the processing unit 802 is further configured to, when the node is an accounting node, not record the transaction information if the specific value is the first specific value.
Optionally, the processing unit 802 is further configured to:
constructing third transaction information; the additional information parameter of the third transaction information is a response message encrypted according to an encryption key of a sender sending the first transaction information;
and sending the third transaction information to the blockchain system.
Optionally, the processing unit 802 is further configured to:
extracting a second transaction information record of the account book of each node in the block chain system;
and decrypting the additional information parameter in the second transaction information by using the self-secret key, and extracting the information content in the additional information parameter when the decryption is successful.
Optionally, the processing unit 802 is further configured to:
acquiring public key information in the first transaction information; the public key is a public key in a public and private key pair generated by a sender;
verifying the signature of the first transaction information according to the public key;
and when the verification is passed, the additional information parameter in the first transaction information is decrypted by using the self-secret key.
Optionally, the processing unit 802 is further configured to:
when the decryption is unsuccessful, the control transceiving unit 801 continues to forward the first transaction information.
In summary, embodiments of the present invention provide an information sending method, an information processing method, and an information sending device, where a transaction target of first transaction information is different from a transmission target, so that even if an attacker can break an association between a node address and a user real identity in a blockchain system, only the user real identity of the transaction target can be obtained, but the user real identity of the transmission target cannot be obtained. In addition, the first transaction information in the embodiment of the present invention does not include address information of the transmission target, and the transmission node determines whether to extract information content in the additional parameter information by whether to decrypt successfully, instead of determining whether to extract information content in the additional parameter information by means of identifying the transmission address, so that even if the first transaction information does not include address information of the transmission target, the transmission target can be ensured to successfully receive the to-be-transmitted information carried in the first transaction information. In addition, the commission parameters of the first transaction information are set to the first specific values so as to prevent the first transaction information from being written into the public account book of the block chain system by the accounting node, and the risk that an attacker maliciously screens the transaction information through the public account book is also avoided. Therefore, the technical scheme disclosed by the embodiment of the invention can enhance the anonymity of anonymous communication.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (18)
1. An information transmission method, comprising:
receiving information to be transmitted and a transmission target input by a user;
acquiring an encryption key of the transmission target, and encrypting the information to be transmitted by using the encryption key;
taking the encrypted information to be transmitted as an additional information parameter of the first transaction information; the transaction target of the first transaction information is different from the transmission target; the commission charge parameter of the first transaction information is set to a first specific value, and the first specific value is used for indicating that a billing node in a blockchain system does not record the first transaction information;
sending the first transaction information through the blockchain system;
and the transmission target is in a state of being incapable of receiving the first transaction information, and resending second transaction information, wherein the additional information parameter of the second transaction information is the encrypted information to be transmitted, the commission charge parameter of the second transaction information is a second specific value, and the second specific value is used for indicating an accounting node in the block chain system to record the second transaction information.
2. The method of claim 1, wherein after sending the first transaction message over the blockchain system, further comprising:
and when a response message sent by the transmission target is received within a preset time interval, confirming that the first transaction information is successfully sent.
3. The method of claim 2, further comprising:
when the response message sent by the transmission target is not received within a preset time interval, the second transaction information is sent again; the additional information parameter of the second transaction information is encrypted information to be transmitted; the commission parameter of the second transaction information is a second specific value, and the second specific value is used for indicating an accounting node in the blockchain system to record the second transaction information.
4. The method of claim 1, wherein after the encrypted information to be transmitted is used as an additional information parameter of the transaction information, the method further comprises:
generating a public and private key pair;
signing the first transaction information with a private key of the public-private key pair; the signed first transaction information comprises public key information in the public and private key pair.
5. An information processing method characterized by comprising:
the transmission node receives first transaction information transmitted by the blockchain system; the transaction target of the first transaction information is different from the transmission target; the additional information parameter of the first transaction information is to-be-transmitted information encrypted by using the encryption key of the transmission target; the commission parameter of the first transaction information is a first specific value, and the first specific value is used for indicating that a billing node in the blockchain system does not record the first transaction information;
and the transmission node decrypts the additional information parameter in the first transaction information by using the own key, and extracts the information content in the additional information parameter when the decryption is successful.
6. The method of claim 5, wherein after extracting the information content in the additional information parameter upon successful decryption, further comprising:
constructing third transaction information; the additional information parameter of the third transaction information is a response message encrypted according to an encryption key of a sender sending the first transaction information;
sending the third transaction information to the blockchain system.
7. The method of claim 5, further comprising:
the transmission node extracts a second transaction information record of an account book of each node in the block chain system;
and the transmission node decrypts the additional information parameter in the second transaction information by using the own key, and extracts the information content in the additional information parameter when the decryption is successful.
8. The method of claim 5, wherein before the transmitting node uses its own key to decrypt the additional information parameter in the first transaction message, further comprising:
acquiring public key information in the first transaction information; the public key is a public key in a public and private key pair generated by a sender;
verifying the signature of the first transaction information according to the public key;
and when the verification is passed, decrypting the additional information parameter in the first transaction information by using the self-secret key.
9. The method of claim 5, further comprising:
and when the decryption is not successful, continuing to forward the first transaction information.
10. An information transmission apparatus, comprising:
the receiving and sending unit is used for receiving information to be transmitted and a transmission target input by a user;
the processing unit is used for acquiring an encryption key of the transmission target and encrypting the information to be transmitted by using the encryption key;
the processing unit is also used for taking the encrypted information to be transmitted as an additional information parameter of the first transaction information; the transaction target of the first transaction information is different from the transmission target; the commission charge parameter of the first transaction information is set to a first specific value, and the first specific value is used for indicating that a billing node in a blockchain system does not record the first transaction information;
the receiving and sending unit is further configured to send the first transaction information through the blockchain system;
the processing unit is further configured to resend the second transaction information when the transmission target is in a state where the transmission target cannot receive the first transaction information, where an additional information parameter of the second transaction information is encrypted to-be-transmitted information, a commission charge parameter of the second transaction information is a second specific value, and the second specific value is used to indicate an accounting node in the blockchain system to record the second transaction information.
11. The apparatus as recited in claim 10, said processing unit to further:
and when a response message sent by the transmission target is received within a preset time interval, confirming that the first transaction information is successfully sent.
12. The apparatus as recited in claim 11, said processing unit to further:
when the response message sent by the transmission target is not received within a preset time interval, the second transaction information is sent again; the additional information parameter of the second transaction information is encrypted information to be transmitted; the commission parameter of the second transaction information is a second specific value, and the second specific value is used for indicating an accounting node in the blockchain system to record the second transaction information.
13. The apparatus as recited in claim 10, said processing unit to further:
generating a public and private key pair;
signing the first transaction information with a private key of the public-private key pair; the signed first transaction information comprises public key information in the public and private key pair.
14. An information processing apparatus characterized by comprising:
the receiving and sending unit is used for receiving first transaction information transmitted by the block chain system; the transaction target of the first transaction information is different from the transmission target; the additional information parameter of the first transaction information is to-be-transmitted information encrypted by using the encryption key of the transmission target; the commission parameter of the first transaction information is a first specific value, and the first specific value is used for indicating that a billing node in the blockchain system does not record the first transaction information;
and the processing unit is used for decrypting the additional information parameter in the first transaction information by using the self key and extracting the information content in the additional information parameter when the decryption is successful.
15. The apparatus as recited in claim 14, said processing unit to further:
constructing third transaction information; the additional information parameter of the third transaction information is a response message encrypted according to an encryption key of a sender sending the first transaction information;
sending the third transaction information to the blockchain system.
16. The apparatus as recited in claim 14, said processing unit to further:
extracting a second transaction information record of an account book of each node in the block chain system;
and decrypting the additional information parameter in the second transaction information by using the self key, and extracting the information content in the additional information parameter when the decryption is successful.
17. The apparatus as recited in claim 14, said processing unit to further:
acquiring public key information in the first transaction information; the public key is a public key in a public and private key pair generated by a sender;
verifying the signature of the first transaction information according to the public key;
and when the verification is passed, decrypting the additional information parameter in the first transaction information by using the self-secret key.
18. The apparatus as recited in claim 14, said processing unit to further:
and when the decryption is not successful, controlling the transceiver unit to continuously forward the first transaction information.
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| 《Bitcoin Message: Data Insertion on a Proof-of-Work Cryptocurrency System》;Matthew D. Sleiman等;《2015 International Conference on Cyberworlds (CW)》;20160204;第333页右栏45-55行，334页右栏1-2行 * |
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| Publication number | Publication date |
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| CN107172074A (en) | 2017-09-15 |
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