TWI637619B - Device for hiding/reverting information of nodes in blockchain and method thereof - Google Patents

Abstract

An apparatus and method for concealing transaction party information in a blockchain transaction, which generates a combination key by using a public key of a receiving end to encrypt a random key, and generates a combined key according to the encryption key, and issues The blockchain transaction including the combined key and the encrypted data is sent to the blockchain network, and after receiving the blockchain transaction in the blockchain network, the receiving end uses the public key to calculate the combined key to obtain the encryption gold. The key, and using the private key corresponding to the public key to decrypt the encryption key to obtain the random key, can hide the transaction-related nodes in the blockchain and achieve the technical effect of the data secret requirement.

Description

Device and method for hiding transaction party information in restored blockchain transaction

A blockchain transaction device and method thereof, in particular, a device and method for concealing information of a transaction party in a blockchain transaction.

A blockchain is a decentralized database that originates from bitcoin. A blockchain is a string of data blocks generated by cryptography. Each data block contains the transaction content of several transactions, and the validity of the verification data block (anti-counterfeiting) and the generation of the next data area. Block of information.

Blockchains are mostly public, and any node in the blockchain network can obtain any data in the blockchain. In order to increase the confidentiality of the transaction, the identification data of the node related to the transaction is recorded in the data block of some blockchains, and the transaction content in the data block is only allowed to be obtained by the node related to the transaction, and Other nodes not related to this transaction cannot obtain the transaction content.

However, it is not enough to hide only the transaction content. Other nodes not related to this transaction can still obtain the transaction content, but can still determine the node related to the transaction content in the data block through the identification data recorded in the data block.

In summary, it can be seen that in the prior art, the transaction through the blockchain has not been able to hide the transaction-related nodes for a long time, so it is necessary to propose an improved technical means to solve this problem.

In view of the prior art, there is a problem that a transaction through a blockchain cannot hide a transaction-related node, and the present invention discloses an apparatus and method for concealing information of a transaction party in a blockchain transaction, wherein:

The device for hiding transaction party information in the hidden blockchain transaction disclosed by the present invention comprises at least: a key generation module for generating a random key; and a data encryption module for encrypting the transaction data by using a random key to generate Encrypted data; a key encryption module, configured to encrypt each random key by using each public key to generate each encryption key, wherein the public key corresponds to the receiving end, and the receiving end corresponds to the encryption key; the key combination module, The method is used to generate a combined key according to the encryption key; the block issuing module is configured to generate a blockchain transaction including the combined key and the encrypted data, and issue the blockchain transaction to the blockchain network.

The device for reducing transaction party information in the blockchain transaction disclosed by the present invention comprises at least a block receiving module for obtaining a blockchain transaction through a blockchain network, and the blockchain transaction includes a combination key and encryption. Data; a key disassembly module for computing a combined key using a public key to obtain an encryption key; and a key decryption module for decrypting the encryption key using a private key corresponding to the public key to obtain A random key; a data decryption module for decrypting encrypted data using a random key to obtain transaction data.

The method for hiding transaction party information in the reduction blockchain transaction disclosed by the present invention comprises the following steps: at least the sender generates a random key; the sender uses the random key to encrypt the transaction data to generate the encrypted data; and the sender uses each disclosure. The key encrypts the random key to generate each encryption key, wherein the public key corresponds to the receiving end, and the receiving end corresponds to the encryption key; the transmitting end generates the combined key according to the encryption key; the transmitting end generates the combined key and the encryption Blockchain transaction of data, and release blockchain transaction to blockchain network; receiver receives blockchain transaction through blockchain network; receiver uses corresponding public key to calculate key combination to obtain Corresponding encryption key; the receiving end decrypts the corresponding encryption key by using the private key corresponding to the corresponding public key to obtain the random key; the receiving end uses the random key to decrypt the encrypted data to obtain the transaction data.

The apparatus and method disclosed in the present invention are as above, and the difference from the prior art is that the present invention generates a combined key according to the encryption key after the encryption key is generated by using the public key of the receiving end to encrypt the random key. And releasing the blockchain transaction including the combined key and the encrypted data into the blockchain network, and after receiving the blockchain transaction, the receiving end uses the public key to calculate the combined key to obtain the encryption key, and uses and The private key corresponding to the public key decrypts the encryption key to obtain a random key, so as to solve the problems existing in the prior art, and can achieve the technical effect of the data secret requirement.

The features and embodiments of the present invention will be described in detail below with reference to the drawings and embodiments, which are sufficient to enable those skilled in the art to fully understand the technical means to which the present invention solves the technical problems, and The achievable effects of the present invention.

The present invention can encrypt a random key using a public key of a transaction party in a blackchain transaction to generate an encryption key, which is received by a node in the blockchain network. In the blockchain transaction, the node's own private key can be used to decrypt the encryption key. If the node is a transaction party, the node can obtain the random key after decryption, and can use the random key to decrypt the area. The transaction data in the blockchain transaction is used for trading, and if the node is not the transaction party, the node cannot decrypt the correct random key, and the transaction data cannot be successfully decrypted by the error key generated by the decryption.

The random key proposed by the present invention is randomly generated by the sending end when the blockchain transaction needs to be released, and is usually a string of a specific length arbitrarily arranged by any number of characters, numbers, and/or symbols. However, the invention is not limited thereto.

The following is a schematic diagram of the components of the apparatus for concealing the information of the parties in the blockchain transaction and the "second diagram" of the present invention, which is the apparatus for reducing the information of the transaction party in the blockchain transaction. A schematic diagram of the components to illustrate the operation of the system of the present invention. As shown in "Fig. 1" and "Fig. 2", the system of the present invention includes a transmitting end 100 of a transaction and a receiving end 200 of a transaction.

The transmitting end 100 and the receiving end 200 of the present invention are a computing device. The computing device of the present invention may include, but is not limited to, one or more processors, memory modules, and bus bars that connect different components, including memory modules and processors.

The processor of the computing device of the present invention is coupled to the bus bar. The processor includes a register group or a scratchpad space, and the register bank or scratchpad space may be entirely on the processing wafer, or alternatively wholly or partially outside the processing wafer and via a dedicated electrical connection and / or directly coupled to the processor via the bus. The processor can be a processing unit, a microprocessor, or any suitable processing element. The computing device of the present invention may also be a multi-processor device, and thus the computing device may also include one or more additional processors that are identical or similar and that are coupled and communicated through the bus.

A processor of the computing device is coupled to the chip set. A chipset consists of one or more integrated circuits (ICs) that contain a memory controller and a peripheral input/output (I/O) controller. The chipset typically provides input and memory management functions, as well as providing a plurality of general purpose and/or dedicated registers, timers, etc., wherein the general purpose and/or dedicated registers and timers are coupled to One or more processors of the chipset access or use. In addition, the memory controller and the peripheral input/output controller may be included in one integrated circuit, or may be implemented using two or more integrated circuits.

The processor can access the memory module and the data in the large-capacity storage area through the memory controller. For example, the memory controller can access the data contained in the cache memory or the hard disk drive. The above memory module includes any type of volatile memory and/or non-volatile memory (NVRAM) memory, such as static random access memory (SRAM), dynamic random access. Memory (DRAM), flash memory (Flash), read-only memory (ROM), etc. The mass storage area described above may include any type of storage device, such as a hard disk drive, a compact disc, a tape drive, a flash drive (flash memory), a solid state disk (SSD), or any other storage device. Wait.

The processor can also communicate with peripheral devices or interfaces such as a peripheral device such as a peripheral device, a wireless communication interface, a wired communication interface, and a GPS receiver through a peripheral output/input controller via a peripheral output/input bus. The peripheral output device can be any type of input and output device, such as a keyboard, a mouse, a trackball, a trackpad, a joystick, a display, a printer, and the like. The wireless communication interface can include an interface that supports wireless networks such as Wi-Fi, Bluetooth, infrared, near field communication (NFC), mobile communication networks, or other wireless data transfer protocols. The wired communication interface can be, for example, an Ethernet device, an asynchronous transfer mode (ATM) device, a DSL modem, a cable modem, or the like. The processor can periodically poll various peripheral devices and interfaces to enable the computing device to perform input and output of data, as well as to communicate with another computing device having the elements described above.

The busbar of the computing device can include one or more types, such as a data bus, an address bus, a control bus, an expansion bus, and / or a bus such as a local bus. Busbars for computing devices include, but are not limited to, side-by-side industry standard architecture (ISA) busses, peripheral component interconnect (PCI) busses, video electronic standards associations (VESA) local busses, and tandem universal sequence busses (USB), Fast Peripheral Component Interconnect (PCI-E) bus, etc.

That is, the transmitting end 100 and the receiving end 200 may be devices or devices having the capability of data computing and data transmission, including but not limited to computers, mobile phones, tablets, watches, televisions, digital cameras, multimedia players, navigation devices. , car computers, walkmans, computer dictionaries, e-book readers, TV game instruments, handheld game instruments.

The transmitting end 100 and/or the receiving end 200 can be connected to the blockchain network 400 through a wired network or a wireless network, but the invention is not limited thereto. The blockchain network 400 may be a public blockchain network or a private blockchain network, and the present invention is also not particularly limited.

The sender 100 is responsible for issuing blockchain transactions. The blockchain transaction sent by the sender 100 includes the encrypted transaction data and the combined encryption key. In some embodiments, the blockchain transaction may also include a hashed message authentication code (keyed-Hash Message Authentication Code). , HMAC). The sending end 100 further includes a key generating module 110, a data encryption module 120, a key encryption module 130, a key combination module 150, a block publishing module 190, and an attachable message generating module. 170.

The key generation module 110 is responsible for generating a random key.

The data encryption module 120 is responsible for encrypting the transaction data using the random key generated by the key generation module 110 to generate encrypted data.

The key encryption module 130 is responsible for generating the encryption keys corresponding to the respective receiving ends 200 by using the random keys generated by the public key encryption key generation module 110 corresponding to the respective receiving ends 200. That is, the key encryption module 130 can generate a plurality of encryption keys that are the same as the number of the transaction parties (receivers 200), wherein each of the receiving ends 200 corresponds to a different public key, and one of them corresponds to one. Different encryption keys, and the public key corresponding to the same receiving end 200 also corresponds to the encryption key.

The key combination module 150 is responsible for generating a combined key according to the encryption key generated by the key encryption module 130. In general, the combination key does not simply combine the encryption keys, but can perform a specific operation on the encryption key, so that the non-transaction party cannot infer the encryption key from the combination key.

For example, the key combination module 150 can use the public key of the receiving end 200 to combine all the encryption keys through the Chinese Remainder Theorem (CRT) to generate a combined key. In more detail, an RSA public key contains an exponent and a modulus, that is, a set of RSA public keys K1, K2, ..., Km contains a set of indices E1, E2, ... , Em and a set of corresponding modules M1, M2, ..., Mm. The key combination module 150 can use a set of public keys K1, K2, ..., Km of the receiving end 200 to encrypt the encryption keys D1, D2, ..., Dm corresponding to the respective receiving ends 200 through the RSA, respectively. A set of encryption results C1, C2, ..., Cm, where Ci = Di ^Ei mod Mi (i = 1~m), after which the key combination module 150 can find the combined key X = Ci mod Ni according to the Chinese remainder theorem And X mod Ni = Ci(i = 1~m).

The message generating module 170 may perform a hash operation on the encrypted data generated by the data encryption module 120 by using the random key generated by the key generation module 110 to generate a hash message authentication code.

The block issue module 190 is responsible for generating blockchain transactions and is responsible for publishing the generated blockchain transactions to the blockchain network 400. The blockchain transaction generated by the block issuing module 190 may include the combined key generated by the key combination module 150 and the encrypted data generated by the data encryption module 120. In addition, the blockchain transaction may also include message generation. The hash message authentication code generated by the module 170 is not limited to the above. The block publishing module 190 can directly or indirectly publish the generated blockchain transaction to the blockchain network 400.

When the receiving end 200 is the correct party, it is responsible for completing the transaction according to the transaction data in the blockchain transaction issued by the sender 100. The receiving end 200 further includes a block receiving module 210, a key disassembling module 220, a key decryption module 230, a data decryption module 250, and an attachable message verification module 240.

The block receiving module 210 is responsible for obtaining the blockchain transaction issued by the transmitting end 100 through the blockchain network 400, that is, acquiring a specific block on the blockchain.

The key disassembly module 220 is responsible for calculating the combination key in the blockchain transaction received by the block receiving module 210 by using the public key corresponding to the receiving end 200, thereby obtaining the encryption gold corresponding to the receiving end 200. key.

For example, the key disassembly module 220 can use the Chinese remainder to determine the combination key to disassemble the encryption key. In more detail, the key disassembly module 220 can obtain the modulus in the public key corresponding to the receiving end 200, calculate the remainder of the combined key pair modulus, and use the corresponding to the receiving end 200 (also That is, the remainder calculated by decrypting the private key corresponding to the public key described above, that is, the encryption key corresponding to the receiving end 200 can be obtained.

The key decryption module 230 is responsible for decrypting the encryption key corresponding to the receiving end 200 obtained by the key disassembly module 220 using the private key corresponding to the public key corresponding to the receiving end 200, thereby obtaining a random key.

The message verification module 240 can perform a hash operation on the encrypted data in the blockchain transaction received by the block receiving module 210 by using the random key obtained by the key decryption module 230, thereby generating verification data, and can determine the inclusion Whether the hash message authentication code in the blockchain transaction matches the generated verification data.

The data decryption module 250 is responsible for using the random key obtained by the key decryption module 230 to decrypt the encrypted data in the blockchain transaction received by the block receiving module 210, so as to obtain the transaction data, so that the receiving end 200 can be based on the transaction. The data performs a trading job to complete the transaction.

When the message authentication module 240 is included in the receiving end 200, the data decryption module 250 can use the message verification module 240 to determine that the hash message authentication code in the blockchain transaction matches the verification data generated by the message verification module. The random key obtained by the key decryption module 230 decrypts the encrypted data in the blockchain transaction received by the block receiving module 210.

Next, an operation system and method of the present invention will be described with reference to an embodiment, and reference is made to the flowchart of the method for hiding transaction party information in the reduction blockchain transaction proposed by the present invention in "3A".

When the sending end 100 needs to send the transaction data to the receiving end 200 through the blockchain network 400, the key generating module 110 of the transmitting end 100 can generate a random key (step 301), and the data encryption module of the transmitting end 100 120 may encrypt the transaction data to be sent to the transaction party using the random key generated by the key generation module 110, thereby generating corresponding encrypted data after performing the encryption operation (step 310). In this embodiment, it is assumed that the transaction party includes a specific receiving end 200a and a receiving end 200b.

Similarly, after the key generation module 110 of the transmitting end 100 generates the random key (step 301), the key encryption module 130 of the transmitting end 100 can use the public key encryption key generation module 110 corresponding to the transaction party. The generated random key is used to generate an encryption key corresponding to each transaction party after performing the encryption operation (step 320). In this embodiment, the key encryption module 130 generates the encryption key corresponding to the receiving end 200a using at least the public key encrypted random key corresponding to the receiving end 200a, and uses the public gold corresponding to the receiving end 200b. The key encrypts the random key to generate an encryption key corresponding to the receiving end 200b.

After the key encryption module 130 of the transmitting end 100 generates the encryption key corresponding to the receiving end 200, the key combination module 150 of the transmitting end 100 can generate a combination according to each encryption key generated by the key encryption module 130. Key (step 330).

After the data encryption module 120 of the transmitting end 100 generates the encrypted data and the key combination module 150 of the transmitting end 100 generates the combined key, the block issuing module 190 of the transmitting end 100 can generate the key containing module 150. The generated combination key and the blockchain transaction of the encrypted data generated by the data encryption module 120, and the generated blockchain transaction can be released into the blockchain network 400 (step 340), so that the blockchain All nodes on the network 400 can obtain the published blockchain transaction.

In this way, the block receiving module 210 of the receiving end 200 can obtain the blockchain transaction issued by the sending end 100 to the blockchain network 400 through the blockchain network 400 (step 350), and the obtained zone is obtained. The combined key and encrypted data are read in the blockchain transaction.

Then, the key disassembly module 220 of the receiving end 200 can calculate the combined key read by the block receiving module 210 of the receiving end 200 by using the public key corresponding to the receiving end 200, thereby obtaining the obtained key after the operation. An encryption key corresponding to the receiving end 200 (step 360). That is, in the present embodiment, the receiving end 200a can use the public key corresponding to the receiving end 200a to calculate the combined key to obtain the encryption key corresponding to the receiving end 200a. Similarly, the receiving end 200b also The encryption key corresponding to the receiving end 200b may be obtained by calculating the combined key using the public key corresponding to the receiving end 200b, wherein the encryption key corresponding to the receiving end 200a is different from the encryption key of the corresponding receiving end 200b. .

After the key disassembly module 220 of the receiving end 200 obtains the encryption key corresponding to the receiving end 200, the key decryption module 230 of the receiving end 200 can use the corresponding to the receiving end 200 (also with the key disassembly module). The private key of the group 220 for the public key corresponding to the combined key decrypts the encryption key obtained by the key disassembly module 220, so that the random key is obtained after decryption (step 370). In other words, in the embodiment, the receiving end 200a can use the private key corresponding to the receiving end 200a to calculate the encryption key corresponding to the receiving end 200a to obtain a random key. Similarly, the receiving end 200b can also The encryption key corresponding to the receiving end 200b is operated using the private key corresponding to the receiving end 200b to obtain a random key.

After the key decryption module 230 of the receiving end 200 obtains the random key, the data decryption module 250 of the receiving end 200 can use the random key obtained by the key decryption module 230 to decrypt the block receiving module of the receiving end 200. 210: The encrypted data read by the blockchain transaction, and the transaction data is obtained after the decryption operation (step 390), so that the receiving end 200 can use the transaction data obtained by the data decryption module 250 to complete the transaction. . At the same time, since the encryption key of the receiving end 200 of the transaction party is replaced by the combined key in the blockchain transaction sent by the transmitting end 100, the receiving end 200 of the transaction party uses the public key pair corresponding to the receiving end 200. Only the encryption key corresponding to the receiving end 200 can be obtained after the key operation. Therefore, even the receiving end 200 of the transaction party cannot determine other parties by the combination key.

In addition, after the transmitting end 100 issues the generated blockchain transaction to the blockchain network 400, if the receiving end 201 that does not belong to the transaction party attempts to access the blockchain transaction issued by the transmitting end 100, then The block receiving module 210 of the receiving end 201 can obtain the blockchain transaction issued by the sending end 100 to the blockchain network 400 through the blockchain network 400 (step 350), and the obtained blockchain is obtained. The combined key and encrypted data are read in the transaction.

Then, the key disassembly module 220 of the receiving end 201 can use the public key corresponding to the receiving end 201 to calculate the combined key read by the block receiving module 210 of the receiving end 201, thereby obtaining and receiving the combined key. 201 corresponds to the encryption key (step 360). However, in this embodiment, since the receiving end 201 is not a transaction party, the transmitting end 100 does not use the public key corresponding to the receiving end 201 to generate an encryption key corresponding to the receiving end 201, and does not use or receive the terminal 201. The corresponding encryption key generation block receives the combination key read by the module 210. Therefore, even if the receiving end 201 performs the operation on the combination key using the public key corresponding to the receiving end 201, the operation result obtained is not The correct encryption key.

After the key decryption module 220 of the receiving end 201 obtains the incorrect encryption key, the key decryption module 230 of the receiving end 201 can use the private key decryption key decryption module 220 corresponding to the receiving end 201. The incorrect encryption key obtained is used to obtain a random key after decryption (step 370). In this embodiment, since the encryption key obtained by the key disassembly module 220 is not the correct encryption key, the key decryption module 230 uses the private key pair key corresponding to the receiving end 201. The calculation result generated by the operation of the encryption key obtained by the disassembly module 220 is not a correct random key.

After the key decryption module 230 of the receiving end 201 obtains the incorrect random key, the data decryption module 250 of the receiving end 201 can decrypt the block of the receiving end 201 by using the random key obtained by the key decryption module 230. The receiving module 210 acquires the encrypted data from the blockchain transaction and obtains the transaction data after the decryption operation (step 390). In this embodiment, since the random key obtained by the key decryption module 230 is not a correct random key, the data decryption module 250 cannot successfully use the key decryption module 230 to obtain an incorrect one. The random key decrypts the encrypted data read by the block receiving module 210 into transaction data.

In this way, since the encrypted data in the blockchain transaction sent by the transmitting end 100 is encrypted, even if the receiving end 201 of the non-transaction party obtains the data in the blockchain transaction, the decryption cannot be successfully decrypted, and at the same time, the transmitting end 100 transmits the data. In the blockchain transaction, the encryption key of the receiving end 200 of the transaction party is replaced by the combination key, and only the receiving end 200 of the transaction party can use the public key corresponding to the receiving end 200 to calculate the combined key. The correct encryption key, so the receiving end 201 of the non-transaction party cannot obtain the encryption key from the combination key to judge the transaction party.

In the above embodiment, the key encryption module 130 at the transmitting end 100 uses the public key generated by the public key encryption key generation module 110 corresponding to the transaction party (receiving end 200) to generate a separate transaction and each transaction. The corresponding encryption key (step 320) and the key combination module 150 of the transmitting end 100 generate a combined key according to each encryption key generated by the key encryption module 130 (step 330), and the message of the transmitting end 100 The generating module 170 may perform a hash operation on the encrypted data generated by the data encryption module 120 of the transmitting end 100 by using a random key to generate a hash message authentication code, and generate a combined key and encryption when generating a blockchain transaction. Blockchain transactions for data and hash message authentication codes.

Then, as shown in the flow of "FIG. 3B", the key decryption module 230 at the receiving end 200 decrypts the encryption obtained by the key disassembly module 220 of the receiving terminal 200 using the private key corresponding to the receiving end 200. After the key is obtained to obtain the random key (step 370), the message verification module 240 of the receiving end 200 can use the random key obtained by the key disassembly module 220 to block the receiving module 210 of the receiving end 200. The encrypted data read in the blockchain transaction is hashed to generate verification data (step 381), and it is determined whether the block receiving module 210 matches the generated authentication information by the hash message authentication code read in the blockchain transaction. (Step 385). If not, the data decryption module 250 of the receiving end 200 can discard the encrypted data read by the block receiving module 210 from the blockchain transaction, that is, the encrypted data is not decrypted.

If the message verification module 240 of the receiving end 200 determines that the block receiving module 210 of the receiving end 200 matches the generated authentication data by the block message transaction, the data of the receiving end 200 is decrypted. The module 250 can use the random key obtained by the key decryption module 230 of the receiving end 200 to decrypt the encrypted data read by the block receiving module 210 from the blockchain transaction, and obtain the transaction data after the decryption operation ( Step 390).

Similarly, the key decryption module 230 at the receiving end 201 of the non-transaction party decrypts the incorrect encryption key using the private key corresponding to the receiving end 201 to obtain an incorrect random key (step 370), and then receives The message verification module 240 of the terminal 201 can perform a hash operation on the encrypted data read by the block receiving module 210 of the receiving end 201 by using an incorrect random key to generate verification data, and determine the block receiving module 210. The read hash message authentication code matches the generated verification data. In this embodiment, since the random key obtained by the key decryption module 230 is not the correct random key, the message verification module 240 uses the incorrect random key pair block receiving module 210. The verification data generated by the operation of the read encrypted data is not the same as the hash information authentication code read by the block receiving module 210. Therefore, the data decryption module 250 of the receiving end 201 can not succeed in decrypting the encrypted data. Decrypted encrypted data.

In summary, it can be seen that the difference between the present invention and the prior art is that after the transmitting end uses the public key of the receiving end to encrypt the random key to generate the encryption key, the combined key is generated according to the encryption key, and the combined combination is released. The blockchain of the key and the encrypted data is traded to the blockchain network, and after receiving the blockchain transaction by the blockchain network, the receiving end uses the public key to calculate the combined key to obtain the encryption key. And using the private key corresponding to the public key to decrypt the encryption key to obtain the random key, and using the random key to decrypt the encrypted data to obtain the transaction data, the technical means can solve the prior art The blockchain transaction cannot hide the problem of trading related nodes, and thus achieve the technical effect of data privacy requirements.

Furthermore, the method for concealing the information of the transaction party in the blockchain transaction of the present invention can be implemented in hardware, software or a combination of hardware and software, or can be implemented in a centralized manner in a computer system or distributed by different components. Implemented in a decentralized manner with several interconnected computer systems.

While the embodiments of the present invention have been described above, the above description is not intended to limit the scope of the invention. Any modification of the form and details of the practice of the present invention, which is a matter of ordinary skill in the art to which the present invention pertains, is a patent protection of the present invention. range. The scope of the invention is to be determined by the scope of the appended claims.

100 sender 110 key generation module 120 data encryption module 130 key encryption module 150 key combination module 170 message generation module 190 block release module 200 receiving end 200a, 200b receiving end 201 receiving end 210 area Block receiving module 220 key disassembly module 230 key decryption module 240 message verification module 250 data decryption module 400 blockchain network step 301 sender generates random key step 310 sender uses random key pair Transaction data encryption to generate encrypted data. Step 320: The sender uses each public key to encrypt the random key to generate each encryption key. Step 330 The sender generates a combined key according to each encryption key. Step 340 The sender generates the combined key and the encrypted data. Blockchain trading, Release Blockchain Transaction to Blockchain Network Step 350 Receiver Obtains Blockchain Transaction Through Blockchain Network Step 360 The receiver uses the corresponding public key to calculate the combined key to obtain the corresponding encryption key. Step 370: The receiving end decrypts the corresponding encryption key by using the corresponding private key to obtain the random key. Step 381 The receiving end performs a hash operation on the encrypted data by using the random key to generate the verification data. Step 385. The receiving end determines the hash message authentication code. Whether it matches the verification data Step 390 The receiving end decrypts the encrypted data using the random key to obtain the transaction data.

1 is a schematic diagram of components of a device for hiding party information in a hidden blockchain transaction according to the present invention. Figure 2 is a schematic diagram showing the components of the apparatus for reducing transaction information in a blockchain transaction proposed by the present invention. FIG. 3A is a flow chart of a method for hiding transaction party information in a hidden blockchain transaction according to the present invention. FIG. 3B is a flow chart of an additional method for the transaction party information in the hidden reduction blockchain transaction proposed by the present invention.

Claims (8)

A method for hiding transaction party information in a blockchain transaction, the method comprising at least the following steps: a sender generates a random key; the sender uses the random key to encrypt a transaction data to generate an encrypted data; The terminal encrypts the random key by using each public key to generate each encryption key, wherein the public key corresponds to a receiving end, and the receiving end corresponds to the encryption key; the sending end is based on the encryption keys. Generating a set of alloy keys; the sender uses the random key to hash the encrypted data to generate a hash message authentication code; the sender generates one of the combined key, the encrypted data, and the hash message authentication code The blockchain trades and publishes the blockchain transaction to a blockchain network. For example, in the method for hiding transaction party information in the blockchain transaction described in claim 1, wherein the sending end generates a set of alloy keys according to the encryption keys, and the transmitting end uses the Chinese remainder theorem to combine the information. Encrypt the key to generate the combined key. A method for restoring transaction party information in a blockchain transaction, the method comprising at least the following steps: a receiving end obtains a blockchain transaction through a blockchain network, the blockchain transaction comprising a set of alloy keys, an encryption Data and a hash message authentication code; the receiving end operates the combined key using a public key to obtain an encryption key; the receiving end decrypts the encryption key using a private key corresponding to the public key To obtain the random key; The receiving end uses the random key to perform a hash operation on the encrypted data to generate a verification data. When the receiving end determines that the hash message authentication code and the verification data match, the random key is used to decrypt the encrypted data to obtain a transaction. data. The method for reducing transaction party information in a blockchain transaction as described in claim 3, wherein the receiving end uses the public key to calculate the combined key to obtain the encryption key, and the receiving end is The encryption key is disassembled from the combination key using the Chinese remainder. A device for hiding transaction party information in a blockchain transaction, the device comprising: at least one key generation module for generating a random key; and a data encryption module for using the random key to a transaction data Encrypting to generate an encrypted data; a key encryption module for encrypting the random key using each public key to generate each encryption key, wherein the public key corresponds to a receiving end, and the receiving end corresponds to a cryptographic key; a key combination module for generating a set of alloy keys according to the cryptographic keys; a message generating module for hashing the encrypted data using the random key to generate a a hash message authentication code; and a block publishing module, configured to generate a blockchain transaction including the combination key, the encrypted data, and the hash message authentication code, and issue the blockchain transaction to a blockchain network. The apparatus for hiding transaction party information in a blockchain transaction as described in claim 5, wherein the key combination module uses the Chinese remainder theorem to combine the encryption keys to generate the combination key. A device for reducing transaction party information in a blockchain transaction, the device comprising at least: a block receiving module for obtaining a blockchain transaction through a blockchain network, the blockchain transaction comprising a set of alloys a key, an encrypted data and a hash message authentication code; a key disassembly module for computing the combined key using a public key to obtain an encryption key; a key decryption module for use A private key corresponding to the public key decrypts the encryption key to obtain a random key; a message verification module is configured to perform a hash operation on the encrypted data to generate a verification data by using the random key, and And determining, by the data decryption module, the data decryption module, when the message verification module determines that the hash message authentication code and the verification data match, using the random key to decrypt the Encrypt the data to obtain the transaction data. For example, the apparatus for reducing transaction party information in the blockchain transaction described in claim 7 of the patent scope, wherein the key disassembly module uses the Chinese remainder to determine the encryption key in the combination key.