WO2019127265A1

WO2019127265A1 - Blockchain smart contract-based data writing method, device and storage medium

Info

Publication number: WO2019127265A1
Application number: PCT/CN2017/119559
Authority: WO
Inventors: 谢辉; 王健; 周阳; 陈敏
Original assignee: 深圳前海达闼云端智能科技有限公司
Priority date: 2017-12-28
Filing date: 2017-12-28
Publication date: 2019-07-04
Also published as: CN110100422B; CN110100422A

Abstract

A blockchain smart contract-based data writing method, a device and a storage medium, which are used to protect private information of a blockchain account. The method comprises: encrypting information to be encrypted of a first blockchain account according to a pre-acquired symmetric key to obtain an information ciphertext of the first blockchain account; encrypting the symmetric key according to a public key of the first blockchain account to obtain a secret key ciphertext of the first blockchain account; by means of a smart contract, writing the information ciphertext of the first blockchain account and the secret key ciphertext of the first blockchain account into a blockchain in which the first block chain account is located.

Description

Data writing method, device and storage medium based on blockchain intelligent contract

Technical field

The present disclosure relates to the field of blockchain technology, and in particular, to a data writing method, device, and storage medium based on a blockchain smart contract.

Background technique

Blockchain technology is a distributed, decentralized, trusted network data consensus storage technology based on a unique block generation mechanism and P2P (Point To Point (point-to-point) network communication mechanism realizes the synchronization problem of distributed computing.

For the traditional public blockchain, the transaction information of any blockchain account is public, and any blockchain account can view the transaction information of other blockchain accounts. However, transaction information for blockchain accounts may include private information (eg, user identity information), and traditional public blockchains do not adequately protect private information.

Summary of the invention

The main purpose of the present disclosure is to provide a data writing method, device and storage medium based on a blockchain smart contract for protecting private information of a blockchain account.

In order to achieve the above object, a first aspect of the present disclosure provides a data writing method based on a blockchain smart contract, including:

Encrypting information to be encrypted of the first blockchain account according to a symmetric key obtained in advance, to obtain an information ciphertext of the first blockchain account;

Encrypting the symmetric key according to the public key of the first blockchain account to obtain a secret key ciphertext of the first blockchain account;

The information ciphertext of the first blockchain account and the secret key ciphertext of the first blockchain account are written into the blockchain of the first blockchain account through the smart contract.

A second aspect of the present disclosure provides a data writing apparatus based on a blockchain smart contract, including:

a first encryption module, configured to encrypt information to be encrypted of the first blockchain account according to a symmetric key obtained in advance, to obtain an information ciphertext of the first blockchain account;

a second encryption module, configured to encrypt the symmetric key according to the public key of the first blockchain account, to obtain a secret key ciphertext of the first blockchain account;

a writing module, configured to write the information ciphertext of the first blockchain account and the secret key ciphertext of the first blockchain account into the block where the first blockchain account is located by using a smart contract In the chain.

A third aspect of the present disclosure provides a data writing apparatus based on a blockchain smart contract, including:

At least one processor unit, a communication interface, a memory, and a communication bus; the at least one processor unit, the communication interface, and the memory complete communication with each other through the communication bus;

The memory is configured to store program code;

The at least one processor unit is configured to execute the program code to implement the method of the first aspect.

A fourth aspect of the present disclosure provides a computer readable storage medium for storing a computer program, the computer program comprising instructions for performing the method of the first aspect.

Using the above technical solution, the information ciphertext of the first blockchain account and the secret ciphertext of the first blockchain account are stored in the blockchain through the smart contract, and the first blockchain account can be decrypted only by the private key. The secret key ciphertext, and then decrypt the information ciphertext of the first blockchain account, to obtain the information to be encrypted of the first blockchain account, and the private key of the first blockchain account is only known to the blockchain The other blockchain accounts on the block are unknown, so other blockchain accounts on the blockchain cannot decrypt the secret ciphertext of the first blockchain account, and cannot further decrypt the information ciphertext of the first blockchain account. Unable to get the information to be encrypted of the first blockchain account. Therefore, the protection of the information to be encrypted of the first blockchain account is implemented by the above method.

DRAWINGS

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are the disclosure of the present disclosure. For some embodiments, other drawings may be obtained from those of ordinary skill in the art without departing from the drawings.

FIG. 1 is a schematic flowchart diagram of a data writing method based on a blockchain smart contract according to an embodiment of the present disclosure.

FIG. 2 is a schematic flowchart of encryption in a data writing method based on a blockchain smart contract according to an embodiment of the present disclosure.

FIG. 3 is a schematic flowchart of decryption in a data writing method based on a blockchain smart contract according to an embodiment of the present disclosure.

FIG. 4 is another schematic flowchart of a data writing method based on a blockchain smart contract according to an embodiment of the present disclosure.

FIG. 5 is another schematic flowchart of a data writing method based on a blockchain smart contract according to an embodiment of the present disclosure.

FIG. 6 is a schematic structural diagram of a data writing apparatus based on a blockchain smart contract according to an embodiment of the present disclosure.

FIG. 7 is a schematic structural diagram of another data writing apparatus based on a blockchain smart contract according to an embodiment of the present disclosure.

Detailed ways

The technical solutions in the embodiments of the present disclosure will be clearly and completely described in conjunction with the drawings in the embodiments of the present disclosure. It is a partial embodiment of the present disclosure, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present disclosure without departing from the inventive scope are the scope of the disclosure.

The embodiment of the present disclosure provides a data writing method based on a blockchain smart contract. FIG. 1 is a schematic flowchart of a data writing method based on a blockchain smart contract according to an embodiment of the present disclosure, as shown in FIG. The method includes the following steps:

Step S101: Encrypt the information to be encrypted of the first blockchain account according to the symmetric key obtained in advance, to obtain the information ciphertext of the first blockchain account;

Step S102: Encrypt the symmetric key according to the public key of the first blockchain account to obtain a secret key ciphertext of the first blockchain account;

Step S103: Write the information ciphertext of the first blockchain account and the secret key ciphertext of the first blockchain account into the blockchain of the first blockchain account through the smart contract.

The first blockchain account may be any blockchain account in the blockchain in which it is located. The information to be encrypted of the first blockchain account includes, but is not limited to, private information of the first blockchain account itself (eg, user identity information) or public information of the first blockchain account itself. Correspondingly, the first blockchain account performs the data writing method based on the blockchain smart contract provided by the embodiment of the present disclosure, and the private information of the first blockchain account itself or the public information of the first blockchain account itself Protect. Optionally, for the public information of the first blockchain account itself, since it is public information, the first blockchain account directly writes it into the blockchain where the first blockchain account is located, so as to speed up data processing. Speed, improve data processing efficiency.

Optionally, before the step S101, the method further includes:

Receiving information to be encrypted sent by the terminal device outside the blockchain;

The received information to be encrypted is determined as the information to be encrypted of the first blockchain account.

The information to be encrypted of the first blockchain account may be provided by any terminal, device or system outside the blockchain. For example, the information to be encrypted is information that needs to be encrypted sent from a terminal device outside the blockchain where the first blockchain account is located. For the terminal device outside the blockchain where the first blockchain account is located, the information that needs to be encrypted is sent to the first blockchain account, and the region based on the embodiment of the present disclosure is executed by the first blockchain account. The data writing method of the blockchain smart contract is to protect the information that the terminal device needs to encrypt.

The obtaining manner of the symmetric key obtained in advance in step S101 includes but is not limited to the following two implementation manners:

The first implementation manner: before each encrypting the information to be encrypted of the first blockchain account, randomly generating the symmetric key, and acquiring the randomly generated symmetric key.

The second implementation manner: before encrypting the information to be encrypted of the first blockchain account for the first time, randomly generating the symmetric key, and acquiring the first randomly generated symmetric key.

In the first implementation manner, the first blockchain account randomly generates a symmetric key before encrypting the encrypted information, and performs the steps S101-S102 by using the randomly generated symmetric key. Since the rules for generating the symmetric key each time are randomly generated, the symmetric key generated by the first blockchain account is different each time, and thus the first blockchain account performs the symmetry used in steps S101-S102 each time. The secret key is different.

In the second implementation manner, before the encryption of the encrypted information is performed for the first time, the first blockchain account randomly generates a symmetric key, and the first randomly generated symmetric key is used to perform steps S101-S102. After the first symmetric generation of the symmetric key, the first blockchain account uses the first randomly generated symmetric key each time steps S101-S102 are performed. That is to say, as long as the first blockchain account randomly generates a symmetric key before encrypting the encrypted information for the first time, it is not necessary to randomly generate a symmetric key again, and the first randomly generated symmetric key is fixed as the first A blockchain account performs the symmetric key used in steps S101-S102, and thus, the first blockchain account is identical in that the symmetric key used in steps S101-S102 is executed each time.

After the first blockchain account acquires the symmetric key in advance, steps S101-S102 are performed. FIG. 2 is a schematic flowchart of encryption in a data writing method based on a blockchain smart contract according to an embodiment of the present disclosure. As shown in FIG. 2, on the one hand, the first blockchain account encrypts the information to be encrypted of the first blockchain account according to the symmetric key obtained in advance, and obtains the information ciphertext of the first blockchain account; In the aspect, the first blockchain account encrypts the pre-acquired symmetric key according to the public key of the first blockchain account, and obtains the secret key ciphertext of the first blockchain account. The information ciphertext of the first blockchain account and the key ciphertext of the first blockchain account constitute a "digital envelope", and thus, the first blockchain account completes the information to be encrypted in the form of a "digital envelope" And encryption of pre-acquired symmetric keys.

After the step S101-S102 is performed in the first blockchain account, step S103 is executed, the information ciphertext of the first blockchain account obtained in step S101 is executed, and the first blockchain account obtained in step S102 is executed. The secret key ciphertext is written into the blockchain where the first blockchain account is located through the smart contract. Since the information in the blockchain is the ciphertext of the first blockchain account and the secret ciphertext of the first blockchain account, only the secret key of the first blockchain account can be decrypted by the private key, and then Decrypting the information ciphertext of the first blockchain account to obtain the information to be encrypted of the first blockchain account, and the private key of the first blockchain account is only known to itself and to other blockchain accounts on the blockchain It is unknowable, so other blockchain accounts on the blockchain cannot decrypt the secret ciphertext of the first blockchain account, and cannot further decrypt the information ciphertext of the first blockchain account, and cannot obtain the first blockchain. The information to be encrypted of the account. Therefore, the protection of the information to be encrypted of the first blockchain account is implemented by the above method.

Optionally, after step S103, the method further includes:

Establishing a first mapping relationship between the blockchain account of the first blockchain account and the secret ciphertext of the first blockchain account and the secret key ciphertext of the first blockchain account;

Reading, according to the blockchain account of the first blockchain account, the information ciphertext of the first blockchain account and the first zone from the blockchain based on the first mapping relationship The secret key ciphertext of the blockchain account;

Decrypting the secret key ciphertext of the first blockchain account according to the private key of the first blockchain account to obtain the symmetric key;

Decrypting the information ciphertext of the first blockchain account according to the symmetric key to obtain information to be encrypted of the first blockchain account.

After the step S103 is performed in the first blockchain account, the information to be encrypted is included in the information ciphertext of the first blockchain account, and is stored in the blockchain where the first blockchain account is located. If the information to be encrypted needs to be obtained, firstly, the information ciphertext of the first blockchain account and the secret ciphertext of the first blockchain account are read from the blockchain where the first blockchain account is located. Examples of reading include, but are not limited to, the following embodiments:

After performing step S103, first establishing a mapping relationship between the blockchain account of the first blockchain account and the secret ciphertext of the first blockchain account and the secret ciphertext of the first blockchain account ( That is, the first mapping relationship), so as to query the information of the first blockchain account from the blockchain where the first blockchain account is located through the first mapping relationship and the blockchain account of the first blockchain account. The secret key of the ciphertext and the first blockchain account is ciphered and read.

FIG. 3 is a schematic flowchart of decryption in a data writing method based on a blockchain smart contract according to an embodiment of the present disclosure. After reading the information ciphertext of the first blockchain account and the secret key ciphertext of the first blockchain account, as shown in FIG. 3, first, the first blockchain account is read out by using its own private key pair. The key ciphertext is decrypted to obtain a symmetric key, and then the read ciphertext is decrypted by using the symmetric key, thereby obtaining information to be encrypted.

The above embodiment is applicable to the case where the information to be encrypted is only disclosed to the first blockchain account, and the other blockchain accounts except the first blockchain account are kept secret.

Optionally, in another embodiment, the information to be encrypted is disclosed to the first blockchain account and the second blockchain account, and other areas than the first blockchain account and the second blockchain account are The blockchain account is confidential, wherein the number of second blockchain accounts is one or more. Correspondingly, the information to be encrypted of the first blockchain account is public information of the second blockchain account, and the first blockchain account and the second blockchain account belong to the same blockchain; FIG. 4 is another schematic flowchart of a data writing method based on a blockchain smart contract according to an embodiment of the present disclosure. As shown in FIG. 4, the method further includes: steps S101-S103 including:

Step S104: Encrypt the symmetric key according to the public key of the second blockchain account to obtain a secret key ciphertext of the second blockchain account;

Step S105: Write the information ciphertext of the first blockchain account and the secret key ciphertext of the second blockchain account into the blockchain through a smart contract.

Optionally, after step S105, the method further includes:

Establishing a second mapping relationship between the blockchain account of the second blockchain account and the secret ciphertext of the first blockchain account and the secret ciphertext of the second blockchain account;

And reading, according to the block mapping account of the second blockchain account, the information ciphertext of the first blockchain account and the first block from the blockchain in the location according to the second mapping relationship The secret key ciphertext of the second blockchain account;

Decrypting the secret key ciphertext of the second blockchain account according to the private key of the second blockchain account to obtain the symmetric key;

Among them, steps S104-S105 are similar to steps S102-S103. After the first blockchain account acquires the symmetric key in advance, steps S101-S102 and step S104 are performed. On one hand, the first blockchain account encrypts the information to be encrypted of the first blockchain account according to the pre-acquired symmetric key to obtain the information ciphertext of the first blockchain account; on the other hand, the first block The chain account encrypts the pre-acquired symmetric key according to the public key of the first blockchain account to obtain the secret key ciphertext of the first blockchain account, and the first blockchain account is based on the second blockchain account. The public key encrypts the pre-acquired symmetric key to obtain the secret key ciphertext of the second blockchain account. The information ciphertext of the first blockchain account and the key ciphertext of the first blockchain account constitute a "digital envelope", the information ciphertext of the first blockchain account and the key of the second blockchain account The ciphertext constitutes another "digital envelope", and thus, the first blockchain account completes the encryption of the encrypted information and the pre-acquired symmetric key in the form of two "digital envelopes".

After the steps S101-S102 and step S104 are performed in the first blockchain account, step S103 and step S105 are performed. The process of performing the step S105 in the first blockchain account is: performing the information ciphertext of the first blockchain account obtained in step S101, and executing the secret key of the second blockchain account obtained in step S104. The texts are all written into the blockchain where the first blockchain account and the second blockchain account are co-located through the smart contract. Since the block ciphertext is stored in the blockchain and the secret ciphertext of the second blockchain account is stored, the second blockchain account can only be decrypted by the private key of the second blockchain account. The secret key ciphertext, or the secret key of the first blockchain account can be decrypted by the private key of the first blockchain account, thereby decrypting the information ciphertext of the first blockchain account, and obtaining the first block The information to be encrypted of the chain account, and the private key of the first blockchain account and the private key of the second blockchain account are only known to oneself and are unknown to other blockchain accounts on the blockchain, so the block The other blockchain accounts on the chain cannot decrypt the secret key ciphertext of the first blockchain account and the secret key ciphertext of the second blockchain account, and cannot further decrypt the information ciphertext of the first blockchain account, and cannot The information to be encrypted of the first blockchain account is obtained. Therefore, only the protection of the information to be encrypted is realized by the above method.

After the first blockchain account acquires the symmetric key in advance, steps S101-S102 are performed. As shown in FIG. 2, on the one hand, the first blockchain account encrypts the information to be encrypted of the first blockchain account according to the symmetric key obtained in advance, and obtains the information ciphertext of the first blockchain account; In the aspect, the first blockchain account encrypts the pre-acquired symmetric key according to the public key of the first blockchain account, and obtains the secret key ciphertext of the first blockchain account. The information ciphertext and the key ciphertext actually constitute a "digital envelope", and thus, the first blockchain account completes the encryption of the encrypted information and the pre-acquired symmetric key in the form of "digital envelope".

After the step S101-S102 is performed in the first blockchain account, step S103 is executed, the information ciphertext of the first blockchain account obtained in step S101 is executed, and the first blockchain account obtained in step S102 is executed. The secret key ciphertext is written into the blockchain where the first blockchain account is located through the smart contract. Since the block cipher and the secret ciphertext are stored in the blockchain, only the private key of the first blockchain account can decrypt the secret ciphertext, thereby decrypting the ciphertext and obtaining the information to be encrypted, and the first zone The private key of the blockchain account is only known to itself and is unknown to other blockchain accounts on the blockchain. Therefore, other blockchain accounts on the blockchain cannot decrypt the secret key ciphertext, and cannot further decrypt the information ciphertext. , can not get the information to be encrypted. Thus, the above method is implemented to realize that the information to be encrypted is only disclosed for the first blockchain account and the second blockchain account.

FIG. 5 is another schematic flowchart of a data writing method based on a blockchain smart contract according to an embodiment of the present disclosure. The following is a description of the data writing method based on the blockchain smart contract provided by the embodiment of the present disclosure.

When the personnel commissioner enters the employee information of an employee, the personal information of the employee's name, ID card, email address, salary, etc., is only allowed to be viewed by the personnel commissioner and the employee himself, and the other personnel are kept confidential; Public information such as travel reimbursement, allowing all employees to view. Therefore, when entering the above private information, the computer used by the personnel commissioner (as the first blockchain account) randomly generates a symmetric key, encrypts the aforementioned private information to form a message ciphertext; and then uses the first blockchain account. The public key and the public key of the computer used by the employee (as the second blockchain account) encrypt the aforementioned symmetric key to form two key ciphertexts. The information ciphertext and the two key ciphertexts are then written into the blockchain in which the first blockchain account and the second blockchain account are co-located through the smart contract. For the aforementioned public information, it is directly written into the blockchain. 5 shows an example of a secret key ciphertext, which forms a digital envelope, and the digital envelope is stored in the blockchain through a smart contract.

After the information is entered in the above manner, the employee's private information is only passed through the employee's private key (ie, the private key of the second blockchain account) or the personnel commissioner's private key (ie, the private key of the first blockchain account). In order to decrypt the corresponding secret key ciphertext, and then decrypt the information ciphertext, to view the employee's private information, other employees cannot view the employee's private information because they do not know the employee's private key or the personnel commissioner's private key.

Based on the same inventive concept, the embodiment of the present disclosure further provides a data writing device based on a blockchain smart contract, which is used to execute the above-described block chain smart contract-based data writing method provided by the embodiment of the present disclosure. FIG. 6 is a schematic structural diagram of a data writing apparatus based on a blockchain smart contract according to an embodiment of the present disclosure. As shown in FIG. 6, the block chain smart contract based data writing device 600 includes:

The first encryption module 601 is configured to encrypt information to be encrypted of the first blockchain account according to a symmetric key obtained in advance, to obtain an information ciphertext of the first blockchain account;

The second encryption module 602 is configured to encrypt the symmetric key according to the public key of the first blockchain account to obtain a secret key ciphertext of the first blockchain account;

a first writing module 603, configured to write the information ciphertext of the first blockchain account and the secret key ciphertext of the first blockchain account into the first blockchain account by using a smart contract In the blockchain.

Optionally, the device further includes:

a first establishing module, configured to establish, by the blockchain account of the first blockchain account, an information ciphertext of the first blockchain account and a secret ciphertext of the first blockchain account First mapping relationship between;

a first reading module, configured to read, according to the first mapping relationship, the information of the first blockchain account from the blockchain according to the blockchain account of the first blockchain account Ciphertext and secret key ciphertext of the first blockchain account;

a first decryption module, configured to decrypt a secret key ciphertext of the first blockchain account according to a private key of the first blockchain account, to obtain the symmetric key;

And a second decrypting module, configured to decrypt the information ciphertext of the first blockchain account according to the symmetric key to obtain information to be encrypted of the first blockchain account.

Optionally, the information to be encrypted of the first blockchain account is public information of a second blockchain account, and the first blockchain account and the second blockchain account belong to the same blockchain. The device also includes:

a third encryption module, configured to encrypt the symmetric key according to the public key of the second blockchain account, to obtain a secret key ciphertext of the second blockchain account;

And a second writing module, configured to write the information ciphertext of the first blockchain account and the secret key ciphertext of the second blockchain account into the blockchain through a smart contract.

Optionally, the device further includes:

a second establishing module, configured to establish, by the blockchain account of the second blockchain account, an information ciphertext of the first blockchain account and a secret ciphertext of the second blockchain account a second mapping relationship between;

a second reading module, configured to read, according to the block mapping account of the second blockchain account, the first blockchain account from the blockchain in the location based on the second mapping relationship Information ciphertext and secret key ciphertext of the second blockchain account;

a third decryption module, configured to decrypt the secret key ciphertext of the second blockchain account according to the private key of the second blockchain account, to obtain the symmetric key;

And a fourth decryption module, configured to decrypt the information ciphertext of the first blockchain account according to the symmetric key to obtain information to be encrypted of the first blockchain account.

Optionally, the device further includes:

a first acquiring module, configured to randomly generate the symmetric key before acquiring the information to be encrypted of the first blockchain account, and obtain the symmetric key generated by the randomization; or

And a second acquiring module, configured to randomly generate the symmetric key before encrypting the information to be encrypted of the first blockchain account for the first time, and obtain a symmetric key generated randomly for the first time.

Optionally, the device further includes:

a receiving module, configured to receive information to be encrypted sent by the terminal device outside the blockchain;

And a determining module, configured to determine the received information to be encrypted as the information to be encrypted of the first blockchain account.

It should be clearly understood by those skilled in the art that, for the convenience and brevity of the description, the specific working process of each module of the above-mentioned block generating device may refer to the corresponding process in the foregoing method embodiment, and details are not described herein again. .

In addition, the division performed by the block generating device component module is only one logical function division, and may be further divided when actually implemented. Moreover, the physical implementation of each module may also be in various manners, which is not limited in this disclosure.

Based on the same inventive concept, the embodiment of the present disclosure further provides a data writing device based on a blockchain smart contract, and FIG. 7 is a structure of another data writing device based on a blockchain smart contract according to an embodiment of the present disclosure. schematic diagram. As shown in FIG. 7, the block chain smart contract based data writing device 110 includes:

At least one processor unit (such as processor unit 111 shown in FIG. 7), communication interface 112, memory 113, and communication bus 114; said at least one processor unit, said communication interface 112, and said memory 113 Communication bus 114 completes communication with each other;

The memory 113 is configured to store program code, and the at least one processor unit is configured to execute the program code to implement a blockchain smart contract based data writing method provided by an embodiment of the present disclosure, with specific reference to the above method. Description of the embodiments.

The embodiment of the present disclosure further provides a non-transitory computer readable storage medium including instructions, such as the above-described memory 113, which may be executed by a processor of the device 110 to complete the blockchain smart contract based on the embodiments of the present disclosure. Data writing method. For example, the non-transitory computer readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device.

The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solutions of the present disclosure within the scope of the technical idea of the present disclosure. These simple variations are all within the scope of the disclosure.

It should be further noted that the specific technical features described in the above specific embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not be further described in various possible combinations.

In addition, any combination of various embodiments of the present disclosure may be made as long as it does not deviate from the idea of the present disclosure, and should also be regarded as the disclosure of the present disclosure.

Claims

A data writing method based on a blockchain smart contract, characterized in that it comprises:

Encrypting information to be encrypted of the first blockchain account according to a symmetric key obtained in advance, to obtain an information ciphertext of the first blockchain account;

Encrypting the symmetric key according to the public key of the first blockchain account to obtain a secret key ciphertext of the first blockchain account;

The information ciphertext of the first blockchain account and the secret key ciphertext of the first blockchain account are written into the blockchain of the first blockchain account through the smart contract.
The method according to claim 1, wherein the information ciphertext of the first blockchain account and the secret key ciphertext of the first blockchain account are written into the first by a smart contract After the blockchain account is in the blockchain, the method further includes:

Establishing a first mapping relationship between the blockchain account of the first blockchain account and the secret ciphertext of the first blockchain account and the secret key ciphertext of the first blockchain account;

Reading, according to the blockchain account of the first blockchain account, the information ciphertext of the first blockchain account and the first zone from the blockchain based on the first mapping relationship The secret key ciphertext of the blockchain account;

Decrypting the secret key ciphertext of the first blockchain account according to the private key of the first blockchain account to obtain the symmetric key;

Decrypting the information ciphertext of the first blockchain account according to the symmetric key to obtain information to be encrypted of the first blockchain account.
The method according to claim 1, wherein the information to be encrypted of the first blockchain account is public information of a second blockchain account, the first blockchain account and the second zone Blockchain accounts belong to the same blockchain; the method also includes:

Encrypting the symmetric key according to the public key of the second blockchain account to obtain a secret key ciphertext of the second blockchain account;

The information ciphertext of the first blockchain account and the secret key ciphertext of the second blockchain account are written into the blockchain through a smart contract.
The method according to claim 3, wherein the information ciphertext of the first blockchain account and the secret key ciphertext of the second blockchain account are written into the block by smart contract After the chain, the method further includes:

Establishing a second mapping relationship between the blockchain account of the second blockchain account and the secret ciphertext of the first blockchain account and the secret ciphertext of the second blockchain account;

And reading, according to the block mapping account of the second blockchain account, the information ciphertext of the first blockchain account and the first block from the blockchain in the location according to the second mapping relationship The secret key ciphertext of the second blockchain account;

Decrypting the secret key ciphertext of the second blockchain account according to the private key of the second blockchain account to obtain the symmetric key;

Decrypting the information ciphertext of the first blockchain account according to the symmetric key to obtain information to be encrypted of the first blockchain account.
The method according to claim 1, wherein before the encrypting the information to be encrypted of the first blockchain account according to the pre-acquired symmetric key, the method further comprises:

Before the information to be encrypted of the first blockchain account is encrypted, the symmetric key is randomly generated, and the symmetric key generated randomly is acquired; or

Before encrypting the information to be encrypted of the first blockchain account for the first time, the symmetric key is randomly generated, and the first randomly generated symmetric key is obtained.
The method according to claim 1, wherein before the encrypting the information to be encrypted of the first blockchain account according to the pre-acquired symmetric key, the method further comprises:

Receiving information to be encrypted sent by the terminal device outside the blockchain;

The received information to be encrypted is determined as the information to be encrypted of the first blockchain account.
A data writing device based on a blockchain smart contract, comprising:

a first encryption module, configured to encrypt information to be encrypted of the first blockchain account according to a symmetric key obtained in advance, to obtain an information ciphertext of the first blockchain account;

a second encryption module, configured to encrypt the symmetric key according to the public key of the first blockchain account, to obtain a secret key ciphertext of the first blockchain account;

a first writing module, configured to write the information ciphertext of the first blockchain account and the secret key ciphertext of the first blockchain account into the first blockchain account by using a smart contract In the blockchain.
The device according to claim 7, wherein the device further comprises:

a first establishing module, configured to establish, by the blockchain account of the first blockchain account, an information ciphertext of the first blockchain account and a secret ciphertext of the first blockchain account First mapping relationship between;

a first reading module, configured to read, according to the first mapping relationship, the information of the first blockchain account from the blockchain according to the blockchain account of the first blockchain account Ciphertext and secret key ciphertext of the first blockchain account;

a first decryption module, configured to decrypt a secret key ciphertext of the first blockchain account according to a private key of the first blockchain account, to obtain the symmetric key;

And a second decrypting module, configured to decrypt the information ciphertext of the first blockchain account according to the symmetric key to obtain information to be encrypted of the first blockchain account.
The apparatus according to claim 7, wherein the information to be encrypted of the first blockchain account is public information of a second blockchain account, the first blockchain account and the second zone Blockchain accounts belong to the same blockchain; the device also includes:

a third encryption module, configured to encrypt the symmetric key according to the public key of the second blockchain account, to obtain a secret key ciphertext of the second blockchain account;

And a second writing module, configured to write the information ciphertext of the first blockchain account and the secret key ciphertext of the second blockchain account into the blockchain through a smart contract.
The device according to claim 9, wherein the device further comprises:

a second establishing module, configured to establish, by the blockchain account of the second blockchain account, an information ciphertext of the first blockchain account and a secret ciphertext of the second blockchain account a second mapping relationship between;

a second reading module, configured to read, according to the block mapping account of the second blockchain account, the first blockchain account from the blockchain in the location based on the second mapping relationship Information ciphertext and secret key ciphertext of the second blockchain account;

a third decryption module, configured to decrypt the secret key ciphertext of the second blockchain account according to the private key of the second blockchain account, to obtain the symmetric key;

And a fourth decryption module, configured to decrypt the information ciphertext of the first blockchain account according to the symmetric key to obtain information to be encrypted of the first blockchain account.
The device according to claim 7, wherein the device further comprises:

a first acquiring module, configured to randomly generate the symmetric key before acquiring the information to be encrypted of the first blockchain account, and obtain the symmetric key generated by the randomization; or

And a second acquiring module, configured to randomly generate the symmetric key before encrypting the information to be encrypted of the first blockchain account for the first time, and obtain a symmetric key generated randomly for the first time.
The device according to claim 7, wherein the device further comprises:

a receiving module, configured to receive information to be encrypted sent by the terminal device outside the blockchain;

And a determining module, configured to determine the received information to be encrypted as the information to be encrypted of the first blockchain account.
A data writing device based on a blockchain smart contract, comprising:

At least one processor unit, a communication interface, a memory, and a communication bus; the at least one processor unit, the communication interface, and the memory complete communication with each other through the communication bus;

The memory is configured to store program code;

The at least one processor unit is configured to execute the program code to implement the method of any of claims 1-6.
A computer readable storage medium, characterized in that the computer readable storage medium is for storing a computer program, the computer program comprising instructions for performing the method of any of claims 1-6.