WO2020186672A1 - Système de transmission et de réception de courriers électroniques sur la base de chaînes de blocs - Google Patents

Système de transmission et de réception de courriers électroniques sur la base de chaînes de blocs Download PDF

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Publication number
WO2020186672A1
WO2020186672A1 PCT/CN2019/096828 CN2019096828W WO2020186672A1 WO 2020186672 A1 WO2020186672 A1 WO 2020186672A1 CN 2019096828 W CN2019096828 W CN 2019096828W WO 2020186672 A1 WO2020186672 A1 WO 2020186672A1
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Prior art keywords
mail
blockchain
data
receiving
ciphertext data
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PCT/CN2019/096828
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English (en)
Chinese (zh)
Inventor
王泽亚
朱波
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深圳幂度信息科技有限公司
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Publication of WO2020186672A1 publication Critical patent/WO2020186672A1/fr

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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
    • H04L9/40—Network security protocols

Definitions

  • This application belongs to the field of blockchain technology, and in particular relates to a blockchain-based mail sending and receiving system.
  • the current e-mail system mainly consists of three parts: mail server, user agent and mail transfer protocol.
  • the mail server provides mail transmission and storage.
  • each mail server provider has its own mail server.
  • User agents are programs that send or read mail, such as the commonly used OutLook, Foxmail, etc.
  • the mail transfer protocol refers to the agreement that must be followed during the transmission of mail. It specifies how different servers (or clients) should exchange information.
  • Common mail transfer protocols include SMPT (Simple Mail Transfer Protocol), POP3 (Post Office Protocol 3), IMAP (Internet Mail Access Protocol), etc.
  • SMPT Simple Mail Transfer Protocol
  • POP3 Post Office Protocol 3
  • IMAP Internet Mail Access Protocol
  • the mail server is centralized and is vulnerable to hacker attacks or the service provider uses user mail data at will without the user's consent, causing user data leakage, especially confidential data, causing great losses to users;
  • E-mails are transmitted and stored in plain text on the Internet, and the contents of the e-mails may be intercepted or modified. Although some mail clients provide data encryption, this function is not used or checked by default. Users often send emails in clear text without their knowledge;
  • Denial of email users One is the denial of the sender, that is, the sender does not admit that the mail has been sent, and the other is the denial of the recipient, that is, the recipient does not recognize the receipt of the mail.
  • the denial of the sender can be solved by digital signature technology, and the denial of the recipient can be ensured by a non-repudiation agreement, which requires more than 5 data exchanges to complete a secure communication and is difficult.
  • the embodiment of the present application provides a blockchain-based mail receiving and dispatching system to solve the problems that the existing mail receiving and dispatching system is likely to cause user data leakage and repudiation.
  • the embodiment of the application provides a blockchain-based mail receiving and sending system, which may include:
  • Blockchain mail client used to send and receive mail, encrypt the content of the sent mail, and decrypt the content of the received mail;
  • the mail block chain system is used to store the transaction data generated during the mail sending and receiving process through each block chain node.
  • the blockchain mail client encrypts the content of the mail to be sent, obtains the mail ciphertext data, constructs transaction data, and sends the transaction data to the mail blockchain system.
  • the transaction The data includes the ciphertext data of the mail, the sender's email address, the recipient's email address, and the sending time;
  • the transaction data is propagated, verified, packaged, and a block is generated through each blockchain node.
  • the blockchain mail client monitors whether there is a new block output, and if there is a new block output, it sends an inquiry message to an associated node, and the associated node is related to the blockchain mail
  • the associated node After receiving the inquiry message, the associated node searches for associated transaction data in the newly generated block, and if the associated transaction data is found, sends the associated transaction data to the blockchain mail Client, the associated transaction data is transaction data including an associated address, and the associated address is an email address corresponding to the blockchain mail client;
  • the blockchain mail client After receiving the associated transaction data, the blockchain mail client determines whether the associated address is the sender's email address, if it is, it determines that the mail is sent successfully, and if not, it determines that a new mail is received.
  • the blockchain mail client parses out the mail ciphertext data from the associated transaction data, and decrypts the mail ciphertext data to obtain the mail content.
  • the email receiving and sending system of the blockchain may further include a decentralized storage system, and the decentralized storage system is used to store ciphertext data of the email.
  • the blockchain mail client encrypts the content of the mail to be sent to obtain mail ciphertext data, and sends the mail ciphertext data to the decentralized storage system;
  • the decentralized storage system After receiving the ciphertext data of the email, the decentralized storage system stores the ciphertext data of the email, and sends response information to the blockchain email client.
  • the response information includes the email Location information of the ciphertext data in the decentralized storage system;
  • the blockchain mail client After receiving the response information, the blockchain mail client constructs transaction data and sends the transaction data to the mail blockchain system.
  • the transaction data includes the mail ciphertext data in the Describe the location information in the decentralized storage system;
  • the mail blockchain system After receiving the transaction data, the mail blockchain system disseminates, verifies, and packages the transaction data through blockchain nodes, and generates blocks.
  • the blockchain mail client encrypts the content of the mail to be sent to obtain mail ciphertext data, constructs transaction data, and sends the transaction data to the mail blockchain system;
  • the mail blockchain system After receiving the transaction data, the mail blockchain system disseminates and verifies the transaction data through each blockchain node;
  • the transaction node initiates a storage request to the decentralized storage system, and sends the email ciphertext data in the transaction data to the decentralized storage system, and the transaction node is a verified blockchain node;
  • the decentralized storage system After receiving the ciphertext data of the mail, the decentralized storage system stores the ciphertext data of the mail and sends response information to the transaction node.
  • the response information includes the ciphertext data of the mail Positioning information in the decentralized storage system;
  • the transaction node After receiving the response information, the transaction node removes the mail ciphertext data from the transaction data, and adds the location information of the mail ciphertext data in the decentralized storage system Enter the transaction data to form transaction data recorded in the mail blockchain system.
  • the blockchain mail client parses out the location information of the mail ciphertext data in the decentralized storage system from the associated transaction data, and according to the mail ciphertext data in the decentralized storage system
  • the location information in the centralized storage system sends a data request to the decentralized storage system
  • the centralized storage system After receiving the data request, the centralized storage system sends the email ciphertext data to the blockchain email client;
  • the blockchain mail client After receiving the mail ciphertext data, the blockchain mail client decrypts the mail ciphertext data to obtain the mail content.
  • the blockchain mail client divides the mail content to be sent into a first mail content and a second mail content, and encrypts the first mail content and the second mail content respectively, Obtain the first mail ciphertext data and the second mail ciphertext data, store the first mail ciphertext data in the mail blockchain system or the decentralized storage system, and store the second mail The ciphertext data is stored in the decentralized storage system.
  • the storing the second mail ciphertext data in the decentralized storage system includes:
  • the second mail ciphertext data is stored on the local storage medium of the blockchain mail client, and the transaction data including local positioning information is sent to the mail blockchain system.
  • the local positioning information is Location information of the second mail ciphertext data on the local storage medium;
  • the mail blockchain system After receiving the transaction data, the mail blockchain system sends the local positioning information in the transaction data to the centralized storage system through a blockchain node;
  • the centralized storage system After receiving the local positioning information, the centralized storage system sends a data acquisition request to the blockchain mail client according to the local positioning information;
  • the blockchain mail client After receiving the data acquisition request, the blockchain mail client sends the second mail ciphertext data to the centralized storage system;
  • the decentralized storage system After receiving the second mail ciphertext data, the decentralized storage system stores the mail ciphertext data, and sends response information to the blockchain node, where the response information includes the first 2.
  • the blockchain node After receiving the response information, the blockchain node constructs new transaction data, and disseminates, verifies, and packages the new transaction data, and generates a block.
  • the new transaction data includes the The location information of the second mail ciphertext data in the decentralized storage system and the first mail data, the first mail data being the first mail ciphertext data or the first mail ciphertext data in the Describe the location information in the decentralized storage system.
  • the embodiment of the application has the beneficial effect that: the blockchain-based mail receiving and sending system provided by the embodiment of the application includes a blockchain mail client and a mail blockchain system, wherein the block The chain mail client is used to send and receive mail, encrypt the content of the sent mail, and decrypt the content of the received mail; the mail blockchain system is used to send and receive mail through each blockchain node The transaction data generated is stored.
  • the user's email plaintext data is encrypted in the blockchain email client, ensuring the security of the data during the sending and transmission phase. Even if the data is intercepted by malicious programs, it is ciphertext.
  • Fig. 1 is a schematic block diagram of a blockchain-based mail receiving and dispatching system provided in the first embodiment
  • FIG. 2 is a schematic diagram of the blockchain mail client sending transaction data to the mail blockchain system in the scenario of the first embodiment
  • Figure 3 is a schematic diagram of a blockchain mail client obtaining mail status
  • FIG. 4 is a schematic diagram of the blockchain mail client displaying the content of the mail in the scenario of the first embodiment
  • FIG. 5 is a schematic block diagram of a blockchain-based mail receiving and sending system provided in Embodiment 2 of the application;
  • FIG. 6 is a schematic diagram of the blockchain mail client sending transaction data to the mail blockchain system in the scenario of the second embodiment
  • FIG. 7 is a schematic diagram of the blockchain mail client displaying the mail content in the scenario of the second embodiment.
  • a blockchain-based mail receiving and sending system in an embodiment of the present application may include a blockchain mail client and a mail blockchain system.
  • the blockchain mail client is used to send and receive mail, encrypt the content of the sent mail, and decrypt the content of the received mail.
  • the mail block chain system is used to store transaction data generated in the process of mail sending and receiving through each block chain node.
  • the mail blockchain system includes a large number of blockchain nodes, and its specific structure and operation mechanism can be any of various existing blockchain systems, which is not specifically limited in this embodiment.
  • the blockchain mail client When the user needs to send mail through the blockchain mail client, the blockchain mail client first encrypts the content of the mail to be sent to obtain the mail ciphertext data. Then, the blockchain mail client will construct the mail ciphertext data and other data into transaction data, and send the transaction data to the mail blockchain system (as shown in Figure 2).
  • the transaction data includes but is not limited to data such as the ciphertext data of the mail, the sender's email address, the recipient's email address, and the sending time.
  • the transaction data is propagated, verified, packaged, and a block is generated through each blockchain node.
  • the blockchain mail client will monitor in real time whether there is a new block output, and if there is a new block output, it will send an inquiry message to the associated node.
  • the node is a blockchain node connected to the blockchain mail client.
  • the associated node After receiving the inquiry message, the associated node searches for associated transaction data in the newly generated block, and if the associated transaction data is found, sends the associated transaction data to the blockchain mail
  • the associated transaction data is transaction data including an associated address
  • the associated address is an email address corresponding to the blockchain mail client.
  • the blockchain mail client After the blockchain mail client receives the associated transaction data, it will perform relevant storage and analysis, and determine whether the associated address is the sender’s email address, if it is, it will determine that the mail is sent successfully, if not, then Determine that a new mail has been received.
  • the blockchain email client when the blockchain email client needs to display the email content, it can parse the email ciphertext data from the associated transaction data and decrypt the email ciphertext data. Obtain the email content, and finally display the decrypted email content.
  • the blockchain mail client After user A fills in the email content and clicks send, the blockchain mail client first encrypts the email content locally with user A's public key to get the email cipher text data: 0xad539598ee5ebf20cfb81b36b7ce1fbeba5748654eb1d15422d0ef3079faee. Subsequently, the blockchain mail client will form a transaction data according to preset rules, such as:
  • the blockchain email client of user A sends the transaction data to the email blockchain system.
  • the transaction data will be transmitted to each blockchain node through the P2P network.
  • the blockchain node will receive the transaction data. Carry out independent verification to verify the legality and integrity of the data. Only the verified transaction data will be added to the transaction data pool by the blockchain node and prioritized according to the given rules. Assuming that the transaction data sent by user A to user B meets the priority requirements and is packaged into blocks by blockchain nodes, each blockchain node starts to compete to produce legal blocks. When a new block is produced (assuming the height of the new block is 1000), the blockchain node that produces the new block will immediately spread the new block through the P2P network.
  • the blockchain mail client After the blockchain mail client learns that there is a new block output, it will initiate a query to the blockchain node connected to it: whether the block with a height of 1000 contains transaction data related to 3b7f77bfcf8d7d30b8a3 (in practice, it passes the bloom filter) If the algorithm initiates an inquiry anonymously), if the block with a height of 1000 contains relevant transaction data, the blockchain node will return the transaction data to the blockchain mail client, and then the blockchain mail client will respond to the transaction data Analyze.
  • User A's client will use “3b7f77bfcf8d7d30b8a3" to match the value of the "from” field and the value of the "to” field respectively, where it matches the value of the "from” field, then the client of user A will prompt the user to send the email successfully.
  • the client of user B will determine that user B's address "2d5bfca369f80e19c6a0" matches the value of the "to” field, and then it will prompt the user to receive a new email.
  • the mail receiving and sending system in this embodiment of the present application may include a decentralized storage system in addition to the blockchain mail client and mail blockchain system in the first embodiment.
  • the storage system includes, but is not limited to, storage systems such as IPFS, which are used to store ciphertext data of the mail, thereby reducing the storage burden of the mail blockchain system.
  • the blockchain email client when a user needs to send emails through the blockchain email client, the blockchain email client first encrypts the content of the email to be sent to obtain the email ciphertext data, and The email ciphertext data is sent to the decentralized storage system.
  • the decentralized storage system After receiving the ciphertext data of the email, the decentralized storage system stores the ciphertext data of the email, and sends response information to the blockchain email client.
  • the response information includes the email
  • the location information of the ciphertext data in the decentralized storage system may also include the storage status, the hash value of the ciphertext data of the mail, and the like.
  • the blockchain mail client judges whether the storage is successful according to the storage status. If not, the user is prompted with information and other operations are performed by the user. If so, the transaction data is constructed, and Send the transaction data to the mail blockchain system, the transaction data includes the location information of the mail ciphertext data in the decentralized storage system, and may also include the sender's email address and the recipient's email address Data such as address and sending time.
  • the blockchain mail client After user A fills in the email content and clicks send, the blockchain mail client first encrypts the email content locally with user A's public key to get the email cipher text data: 0xad539598ee5ebf20cfb81b36b7ce1fbeba5748654eb1d15422d0ef3079faee. Subsequently, the blockchain mail client will send the ciphertext data of the email to the decentralized storage system, and the decentralized storage system will return the following response information:
  • the mail blockchain system After receiving the transaction data, the mail blockchain system disseminates, verifies, and packages the transaction data through blockchain nodes, and generates blocks.
  • the blockchain mail client when the blockchain mail client needs to display the content of the mail, it can parse out the location information of the mail ciphertext data in the decentralized storage system from the associated transaction data. And send a data request to the decentralized storage system according to the location information of the mail ciphertext data in the decentralized storage system.
  • the centralized storage system After receiving the data request, the centralized storage system sends the email ciphertext data to the blockchain email client.
  • the blockchain mail client After receiving the ciphertext data of the mail, the blockchain mail client decrypts the ciphertext data of the mail to obtain the mail content, and finally displays the decrypted mail content.
  • the mail receiving and sending system in this embodiment also includes a blockchain mail client, a mail blockchain system, and a decentralized storage system.
  • the blockchain mail client initiates a storage request to the decentralized storage system
  • the blockchain node in the mail blockchain system initiates storage to the decentralized storage system. request.
  • the blockchain email client first encrypts the content of the email to be sent to obtain the email ciphertext data, construct transaction data, and
  • the transaction data is sent to the mail blockchain system, and the transaction data includes, but is not limited to, the mail ciphertext data, the sender's email address, the recipient's email address, and the sending time.
  • the mail blockchain system After receiving the transaction data, the mail blockchain system disseminates and verifies the transaction data through each blockchain node.
  • the transaction node initiates a storage request to the decentralized storage system, and sends the email ciphertext data in the transaction data to the decentralized storage system, and the transaction node is a verified blockchain node.
  • the decentralized storage system After receiving the ciphertext data of the mail, the decentralized storage system stores the ciphertext data of the mail and sends response information to the transaction node.
  • the response information includes the ciphertext data of the mail
  • the location information in the decentralized storage system may also include the storage status, the hash value of the ciphertext data of the mail, and the like.
  • the transaction node After receiving the response information, the transaction node removes the mail ciphertext data from the transaction data, and adds the location information of the mail ciphertext data in the decentralized storage system Enter the transaction data to form transaction data recorded in the mail blockchain system.
  • the blockchain mail client After user A fills in the email content and clicks send, the blockchain mail client first encrypts the email content locally with user A's public key to get the email cipher text data: 0xad539598ee5ebf20cfb81b36b7ce1fbeba5748654eb1d15422d0ef3079faee. Subsequently, the blockchain mail client will form a transaction data according to preset rules, such as:
  • the blockchain node in the email blockchain system will perform independent verification after obtaining the transaction data. For the transaction data that has passed the verification, the value of the "data" field of the transaction data will be parsed, and a storage request will be initiated to the decentralized storage system. If there is no storage of the data in the decentralized storage system, if there is no hash of the ciphertext data, then the data will be stored and returned to the corresponding content hash or URL or other location information to the corresponding blockchain node If the storage of the data already exists in the decentralized storage system, the storage location of the data will be returned to the corresponding blockchain node, such as the hash of the mail ciphertext data in the decentralized storage system: 0xea674fdde714fd979de3edf0f56aa9716b898ec8. The blockchain node will add the hash to the transaction data and remove the email ciphertext data field in the transaction data, such as:
  • the mail receiving and sending system in this embodiment also includes a blockchain mail client, a mail blockchain system, and a decentralized storage system.
  • the blockchain mail client initiates a storage request to the decentralized storage system.
  • the decentralized storage system actively initiates the data acquisition request. This embodiment is particularly suitable for email content. Including large text or attachments.
  • the blockchain email client first divides the email content to be sent into a first email content and a second email content.
  • the content of an email is small text data
  • the content of the second email is large text or an attachment.
  • the blockchain mail client separately encrypts the first mail content and the second mail content to obtain the first mail ciphertext data and the second mail ciphertext data, and the first mail
  • the ciphertext data is stored in the mail blockchain system or the decentralized storage system
  • the second mail ciphertext data is stored in the decentralized storage system.
  • the process of storing the first mail ciphertext data in the mail blockchain system is similar to the process in the first embodiment, and storing the first mail ciphertext data in the decentralized storage system
  • the process in is similar to the process in the second embodiment.
  • the process of storing the second email ciphertext data in the decentralized storage system specifically includes the following process:
  • the blockchain mail client stores the second mail ciphertext data on the local storage medium of the blockchain mail client, and sends transaction data including local positioning information to the mail blockchain system , To propagate among the various blockchain nodes of the mail blockchain system, and the local positioning information is the positioning information of the second mail ciphertext data on the local storage medium, such as a local URL or other Form of positioning information.
  • the transaction data may also include data such as the sender's email address, the recipient's email address, and the sending time.
  • the email blockchain system After the email blockchain system receives the transaction data, it parses the transaction data through the blockchain node, and when the specific data field is parsed, it communicates with the decentralized storage system, The local positioning information in the transaction data is sent to the centralized storage system.
  • the centralized storage system After receiving the local positioning information, the centralized storage system sends a data acquisition request to the blockchain mail client according to the local positioning information.
  • the blockchain mail client After receiving the data acquisition request, the blockchain mail client sends the second mail ciphertext data to the centralized storage system.
  • the decentralized storage system After receiving the second mail ciphertext data, the decentralized storage system stores the mail ciphertext data and sends response information to the blockchain node, where the response information includes the first
  • the location information of the second mail ciphertext data in the decentralized storage system may also include storage status, the hash value of the second mail ciphertext data, and the like.
  • the blockchain node After receiving the response information, the blockchain node constructs new transaction data, and disseminates, verifies, and packages the new transaction data, and generates a block.
  • the new transaction data includes the The location information of the second email ciphertext data in the decentralized storage system and the first email data may also include data such as the sender's email address, the recipient's email address, and the sending time.
  • the first email data is all The first mail ciphertext data (corresponding to the situation of storing the first mail ciphertext data in the mail blockchain system) or the first mail ciphertext data in the decentralized storage system
  • the location information (corresponding to the situation of storing the first email ciphertext data in the decentralized storage system).
  • user A sends an email to user B.
  • the email content also includes a 20M audio attachment.
  • the blockchain email client After user A fills in the email content and clicks send, the blockchain email client first performs asymmetric encryption of the text information and audio attachments locally with the public key of user A, and obtains 0xad539598ee5ebf20cfb81b36b7ce1fbeba5748654eb1d15422d0ef3079faee and 0x3d27146593c566cac92119d76f1ec874.
  • Each blockchain node will parse out the "data2" field value in the transaction data, that is, "http://192.168.1.123:8888/UserA/mail/e07dced0592d6c3ed8e33011" and submit it to the decentralized storage system. After obtaining the URL, the decentralized storage system will request user A's blockchain email client to obtain the email ciphertext data resource. After the decentralized storage system completes the storage of the email ciphertext data, the location information of the email ciphertext data is returned to the corresponding blockchain node, for example, the hash is 0xa828a6989deec5905636ac8e07dced0592d6c3e. In the end, the blockchain node nodes form the following transaction data according to certain rules:
  • the process of displaying the email content by the blockchain email client can also refer to the specific descriptions in Embodiment 1 and Embodiment 2, which will not be repeated here.
  • the user's mail plaintext data is encrypted in the blockchain mail client, which ensures the security of the data during the sending and transmission stage. Even if the data is intercepted by malicious programs, it is ciphertext. If the ciphertext data is tampered with, the check code will also become invalid, and the blockchain node will not pass the verification. Moreover, due to the decentralized storage and With features such as non-tampering, users cannot delete and modify their behavior of sending and receiving emails, which can effectively prevent user denial.

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Information Transfer Between Computers (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

La présente invention relève du domaine technique des chaînes de blocs. Elle concerne plus précisément un système de transmission et de réception de courriers électroniques sur la base de chaînes de blocs. Le système de transmission et de réception de courriers électroniques comprend un client de courriers électroniques de chaînes de blocs et un système de chaînes de blocs de courriers électroniques. Le client de courriers électroniques de chaînes de blocs est utilisé pour transmettre et recevoir des courriers électroniques, pour chiffrer le contenu d'un courrier électronique envoyé et pour déchiffrer le contenu d'un courrier électronique reçu. Le système de chaînes de blocs de courriers électroniques est utilisé pour stocker des données de transactions générées pendant un processus de transmission et de réception de courriers électroniques au moyen de nœuds de chaînes de blocs respectifs. Dans le système, puisque les données de texte en clair d'un courrier électronique envoyé par un utilisateur sont chiffrées par un client de courriers électroniques de chaînes de blocs, la sécurité des données est assurée pendant les étapes d'envoi et de transmission. Même si les données sont interceptées par un programme malveillant, les données interceptées se présentent sous la forme d'un texte chiffré. Une falsification des données du texte chiffré rend un code de contrôle invalide. Ces données seront donc rejetées lors d'une authentification effectuée par un nœud de chaîne de blocs. Les caractéristiques d'une chaîne de blocs, telles qu'une mémorisation décentralisée et une inviolabilité, peuvent prévenir efficacement un refus de la part d'un utilisateur.
PCT/CN2019/096828 2019-03-18 2019-07-19 Système de transmission et de réception de courriers électroniques sur la base de chaînes de blocs WO2020186672A1 (fr)

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CN110601955B (zh) * 2019-09-06 2022-04-19 创新先进技术有限公司 基于区块链的电子信件投递方法、装置及设备
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