CN108830600B - Block chain-based electronic invoice system and implementation method - Google Patents

Block chain-based electronic invoice system and implementation method Download PDF

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CN108830600B
CN108830600B CN201810632013.9A CN201810632013A CN108830600B CN 108830600 B CN108830600 B CN 108830600B CN 201810632013 A CN201810632013 A CN 201810632013A CN 108830600 B CN108830600 B CN 108830600B
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CN108830600A (en
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何贵清
陶文华
林大海
刘松光
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Foresee Technology Co ltd
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    • G06Q20/382Payment protocols; Details thereof insuring higher security of transaction
    • G06Q20/3829Payment protocols; Details thereof insuring higher security of transaction involving key management
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    • G06QINFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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    • G06Q20/40Authorisation, e.g. identification of payer or payee, verification of customer or shop credentials; Review and approval of payers, e.g. check credit lines or negative lists
    • G06Q20/401Transaction verification
    • G06Q20/4014Identity check for transactions
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06QINFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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    • G06Q30/04Billing or invoicing

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Abstract

An electronic invoice system based on a block chain and an implementation method thereof are provided, wherein the method comprises the following steps: (S1) application for registration: the tax bureau terminal generates a private key on the block chain system according to the requirement of the tax user, and generates a public key and an address through the generated private key; (S2) returning the private key: the tax user can inquire the invoice according to the address generated by the tax bureau end, and carry out identity authentication or decryption through a public key and a private key; (S3) invoice purchase: the tax bureau side writes the invoice balance of the tax payment user into the block chain system and returns the invoice balance to the tax payment user side; (S4) issuing an invoice: the tax payment user side inputs invoice data, encrypts the input data and uploads the encrypted data to the regional chain system; (S5) invoice query: and inquiring invoice information according to the address and the private key of the tax payment user side. The invention has the advantages that: the method has the advantages of high mutual reliability, data non-tampering, data traceability, interconnection and intercommunication, distributed storage, decentralization and the like.

Description

Block chain-based electronic invoice system and implementation method
Technical Field
The invention relates to the technical field of tax electronic invoices, in particular to an electronic invoice system based on a block chain and an implementation method.
Background
The electronic invoice is a product of an information era, is used by merchants in a form of uniform distribution of a tax bureau like a common invoice, adopts national uniform coding for invoice numbers, adopts a uniform anti-counterfeiting technology and is distributed to the merchants, and a signature mechanism of the electronic tax bureau is attached to the electronic invoice. For a long time, the existing electronic invoice systems have the following problems:
(1) the electronic invoice data issued by the taxpayer is gathered and stored in a third-party platform, a third-party platform provider can access all invoice data of users in the platform, the data storage and management standards of the third-party service platform are not standard, and the risk of leakage and illegal utilization of the electronic invoice data exists. (2) Standards for electronic invoice data transmission, storage and the like are not standard. (3) The third party service providers are numerous, the entrances of different electronic invoice service platforms are different, taxpayers who have difficulty in acquiring invoices by a ticket receiver cannot inquire and print the invoices through a uniform inquiry verification entrance, and the invoices acquired by the ticket receiver cannot be collected in a cross-platform mode. (4) The national tax administration does not store PDF format files, and each third-party bottle body is independently stored, so that an information island exists. (5) The examination and download of electronic invoice layout files does not provide a uniform path for authority. (6) Due to the characteristics of repeatable copying and submission, the electronic invoice format file brings new problems to reimbursement management, posting management and archiving management of enterprises.
Disclosure of Invention
Aiming at the defects of the prior art, the invention discloses an electronic invoice system based on a block chain and an implementation method thereof, which can effectively solve the problems of data security risk and management in issuing, transferring, checking, reimbursement and posting in the traditional electronic invoice system. The invention has the advantages that: the method has the advantages of high mutual reliability, data non-tampering, data traceability, interconnection and intercommunication, distributed storage, decentralization and the like.
The invention adopts the following technical scheme: an electronic invoice system based on a block chain comprises a tax payment user terminal, a tax administration terminal, a block chain system and a block chain network; the block chain system comprises block chain link points which are gradually increased in a chain generation mode, the block chain link points are connected in a chain mode, the block chain link points issue related information of interaction between the tax payment user side and the tax administration side and data information of each adjacent node in at least one target adjacent node to a block chain network, and the data information comprises secret key information and address information;
the block chain network comprises tax payment user nodes, tax bureau nodes, response nodes and information identification nodes, wherein the tax payment user nodes and the tax bureau terminals carry out information interaction on the block chain system through the block chain network, the tax payment user nodes transmit data information of the tax bureau nodes through the block chain network, the response nodes feed back information sent to the tax payment user nodes by the tax bureau nodes, and the information identification nodes convert the information of the tax payment user nodes and the tax bureau nodes, so that the tax payment user nodes and the tax bureau terminals can identify information of each other.
Further, the block chain system further comprises a block chain bottom platform, and the block chain bottom platform adopts any one of a Hyperridge block chain technology platform or an Ethenhouse block chain bottom platform.
Further, the Hyperleader blockchain technology platform is a Linux foundation open source super account book technology platform.
An electronic invoice realization method based on a block chain comprises the following steps:
(S1) the tax payment user applies for registration with the tax office: the tax bureau terminal generates a private key on the block chain system according to the requirement of the tax user, and generates a public key and an address through the generated private key;
(S2) the tax office returns a private key to the tax payer: the tax user can inquire the invoice according to the address generated by the tax bureau end, and carry out identity authentication or decryption through a public key and a private key;
(S3) invoice purchase: the tax bureau side writes the invoice balance of the tax payment user into the block chain system and returns the invoice balance to the tax payment user side;
(S4) issuing an invoice: the tax payment user side inputs invoice data, encrypts the input data and uploads the encrypted data to the regional chain system;
(S5) invoice query: and inquiring invoice information according to the address and the private key of the tax payment user side.
Further, in the step (S1), the tax administration side is further connected to a CA server, and the tax administration side authorizes the electronic digital certificate through the CA server.
Further, the method for generating the private key and the public key in the step (S1) is an elliptic curve encryption algorithm based on an encryption algorithm, and the specific method is as follows:
(S11) forming a private key by a random algorithm; randomly selecting 256 digits, selecting a random entropy source for the selected data according to an SHA256 algorithm, adopting hexadecimal identification if the private key displays 64 digits, and adopting dumpprivkey identification if the private key displays the private key by using bitcoin;
(S12) forming a public key from the private key according to an elliptic algorithm; the formula for generating the public key by the private key is that K (K) G K is the private key, G is a discrete constant point, and K is the public key;
(S13) forming an address of the tax user demand information based on the public key; the public key address of the tax user demand information starts with 1, and a is ripemmd 160(SHA256(K)), where K is the public key and a is the address of the tax user demand information, which is formed into a 20-byte address via Base 58.
Further, the method for querying the invoice of the tax payment user terminal in the step (S2) includes: the tax paying user logs in an account on the block chain system through the tax paying user side, the tax paying user receives the data information of the tax bureau node transmitted by the block chain network by using the tax paying user node, and the data information of the tax bureau node is identified by the information identification node to obtain the information issued by the tax bureau side.
Further, the method for writing the invoice balance of the tax payer into the blockchain system by the tax office in the step (S3) is as follows: logging in the account of the tax bureau terminal on the block chain system, acquiring invoice settlement information of the tax user by the tax bureau node through the regional chain network, identifying the invoice settlement information by the information identification node, electronically signing the identified information by the tax bureau terminal, then releasing the signed information on the block chain system, and sending signing information to other block chain nodes by the block chain system through the block node of the block chain system.
Further, the step of entering invoice data in the step (S4) includes:
(S41) generating electronic invoice information from the invoice content information;
(S42) generating the electronic invoice information into a PDF format;
(S43) generating a random password;
(S44) encrypting the data with a random password;
(S44) encrypting the invoice data with the random password;
(S45) encrypting the random password by using public keys of the tax bureau side and the tax payment user side;
(S46) inquiring the address of the tax client, and placing the invoice cryptograph and the key cryptograph on the addresses of the tax bureau and the tax client in the block chain system.
Further, the invoice query method in the step (S5) is as follows: the tax paying user firstly inquires invoice data belonging to the tax paying user according to the block chain address of the tax paying user, then analyzes the plaintext of the random key according to the private key, and then can analyze the plaintext of the invoice according to the random key, thereby obtaining the invoice data.
Has the positive and beneficial effects that:
the invention can effectively solve the problems of data security risk and management in issuing, transferring, checking, reimbursing and posting of the traditional electronic invoice system, has high mutual reliability, non-falsification of data, data traceability, interconnection, distributed storage, decentralization and the like, is effectively applied to electronic invoice services, and is mainly embodied in the following points:
1. confirming the unique digital identity of the taxpayer through a secret key technology in a block chain;
2. the method ensures that the contents of the invoice issuing data are not leaked and illegally utilized through an encryption algorithm in a block chain;
3. a safe and reliable mutual trust channel is provided through a block chain, and the problem of data islands is solved;
4. the authenticity and the integrity of invoice data are ensured through the data non-tampering characteristic of the block chain;
5. the invoice authenticity verification service is provided through technologies such as zero knowledge proof in a block chain;
6. the requirements of service supervision and examination are met through the data traceability characteristic of the block chain;
7. files on the block chain are stored in a distributed mode, the single-point problem is avoided, and data are guaranteed not to be lost forever.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic structural diagram of a tax payment user applying for registration from a tax administration end according to the present invention;
FIG. 3 is a schematic structural diagram of invoice purchase receipt by a tax payer in the invention;
FIG. 4 is a schematic diagram of the structure of the invoice presented in the present invention;
FIG. 5 is a schematic diagram of an invoice query according to the present invention;
FIG. 6 is a flowchart of the method of the present invention;
FIG. 7 is a flowchart of a method for generating a private key and a public key according to the present invention.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings, and it should be understood that the embodiments described herein are merely for the purpose of illustrating and explaining the present invention and are not intended to limit the present invention.
As shown in fig. 1, an electronic invoice system based on block chain includes a tax payment user terminal, a tax administration terminal, a block chain system and a block chain network; the block chain system comprises block chain link points which are gradually increased in a chain generation mode, the block chain link points are connected in a chain mode, the block chain link points issue related information of interaction between the tax payment user side and the tax administration side and data information of each adjacent node in at least one target adjacent node to a block chain network, and the data information comprises secret key information and address information;
the block chain network comprises tax payment user nodes, tax bureau nodes, response nodes and information identification nodes, wherein the tax payment user nodes and the tax bureau terminals carry out information interaction on the block chain system through the block chain network, the tax payment user nodes transmit data information of the tax bureau nodes through the block chain network, the response nodes feed back information sent to the tax payment user nodes by the tax bureau nodes, and the information identification nodes convert the information of the tax payment user nodes and the tax bureau nodes, so that the tax payment user nodes and the tax bureau terminals can identify information of each other.
In the invention, the block chain system further comprises a block chain bottom platform, and the block chain bottom platform adopts any one of a HyperLegger block chain technology platform or an Ethengfang block chain bottom platform. Further, the Hyperleader blockchain technology platform is a Linux foundation open source super account book technology platform.
As shown in fig. 6, an electronic invoice implementation method based on a block chain includes the following steps:
(S1) the tax payment user applies for registration with the tax office: the tax bureau terminal generates a private key on the block chain system according to the requirement of the tax user, and generates a public key and an address through the generated private key;
(S2) the tax office returns a private key to the tax payer: the tax user can inquire the invoice according to the address generated by the tax bureau end, and carry out identity authentication or decryption through a public key and a private key;
(S3) invoice purchase: the tax bureau side writes the invoice balance of the tax payment user into the block chain system and returns the invoice balance to the tax payment user side;
(S4) issuing an invoice: the tax payment user side inputs invoice data, encrypts the input data and uploads the encrypted data to the regional chain system;
(S5) invoice query: and inquiring invoice information according to the address and the private key of the tax payment user side.
The implementation method of the present invention will be further described below with reference to the above steps.
For steps (S1) and (S2):
as shown in fig. 2, in the step (S1), the tax administration side is further connected to a CA server, and the tax administration side authorizes the electronic digital certificate through the CA server. In step (S1), when the tax paying user registers, the tax administration generates a private key, and generates a public key and an address through the private key, where the address is used to store invoice and inventory information of the tax paying user on the blockchain system, the public key is used to verify the identity of the tax paying user (in a specific embodiment, usually an enterprise) or encrypted data, the private key is used to encrypt the identity verification information or decrypt the data, and only the user with the private key can view corresponding plaintext data. The tax office end can provide the private key for the tax payment user, and because the private key is only owned by the tax office end and the tax payment user end, only the tax office end or the tax payment user end can check the invoice data on the block chain, and other anyone can not decrypt the invoice plaintext even taking the data on the block chain. Only the taxing authority node may be required to have account registration rights.
Further, as shown in fig. 7, in the step (S1), the method for generating the private key and the public key in the step (S1) is an elliptic curve encryption algorithm based on an encryption algorithm, and the specific method is as follows:
(S11) forming a private key by a random algorithm; the method comprises the steps of randomly selecting 256 digits, selecting a random entropy source for selected data according to an SHA256 algorithm, adopting a hexadecimal mark if a private key displays 64 digits, and adopting a dumpprivkey mark if the private key displays the private key by using bitcoin, wherein the selection can be carried out according to user requirements.
In cryptography, random sequences are important, and are used in key generation, digital signatures, authentication, and numerous cryptographic protocols. Therefore, the generation of high-quality random number sequences plays an important role in the information security, and the private key formed by the random algorithm has good confidentiality.
(S12) forming a public key from the private key according to an elliptic algorithm; the formula for generating the public key by the private key is that K is K G K and is the private key, G is a discrete constant point, and K is the public key.
(S13) forming an address of the tax user demand information based on the public key; the public key address of the tax user demand information starts with 1, and a is ripemmd 160(SHA256(K)), where K is the public key and a is the address of the tax user demand information, which is formed into a 20-byte address via Base 58.
In step (S2), the method for the tax payment user side to query the invoice in step (S2) is: the tax paying user logs in an account on the block chain system through the tax paying user side, the tax paying user receives the data information of the tax bureau node transmitted by the block chain network by using the tax paying user node, and the data information of the tax bureau node is identified by the information identification node to obtain the information issued by the tax bureau side.
For step (S3):
as shown in fig. 3, after the tax payment user receives the invoice, the corresponding invoice balance is also written into the block chain for verification when the invoice data is linked. The method for writing the invoice balance of the tax user into the block chain system by the tax office in the step (S3) is as follows: logging in the account of the tax bureau terminal on the block chain system, acquiring invoice settlement information of the tax user by the tax bureau node through the regional chain network, identifying the invoice settlement information by the information identification node, electronically signing the identified information by the tax bureau terminal, then releasing the signed information on the block chain system, and sending signing information to other block chain nodes by the block chain system through the block node of the block chain system.
For step (S4):
as shown in fig. 4, after the tax user inputs invoice data, the data is encrypted by using the random key, the random key is encrypted by using the public keys of the invoicer and the invoicee, and finally the ciphertext of the invoice and the secret key is uploaded to the block chain together. The block chain is stored with invoice inventory information, and the invoice codes and invoice numbers of enterprises can be ensured to be effective through checking the inventory information, so that the generation of junk data is prevented. Wherein the step of entering invoice data in the step (S4) comprises:
(S41) generating electronic invoice information from the invoice content information;
(S42) generating the electronic invoice information into a PDF format;
(S43) generating a random password;
(S44) encrypting the data with a random password;
(S44) encrypting the invoice data with the random password;
(S45) encrypting the random password by using public keys of the tax bureau side and the tax payment user side;
(S46) inquiring the address of the tax client, and placing the invoice cryptograph and the key cryptograph on the addresses of the tax bureau and the tax client in the block chain system.
For step (S5):
as shown in fig. 5, when inquiring invoices, a tax user firstly inquires invoice data belonging to the tax user according to a block chain address of the tax user, then analyzes a plaintext of a random key according to a private key, and can analyze the plaintext of the invoice according to the random key, so as to obtain the invoice data. The invoice query method in the step (S5) is as follows: the tax paying user firstly inquires invoice data belonging to the tax paying user according to the block chain address of the tax paying user, then analyzes the plaintext of the random key according to the private key, and then can analyze the plaintext of the invoice according to the random key, thereby obtaining the invoice data.
The invention can effectively solve the problems of data security risk and management in issuing, transferring, checking, reimbursing and posting of the traditional electronic invoice system, has high mutual reliability, data non-falsification, data traceability, interconnection, distributed storage, decentralization and the like, and is effectively applied to electronic invoice services.
Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that these specific embodiments are merely illustrative and that various omissions, substitutions and changes in the form of the detail of the methods and systems described above may be made by those skilled in the art without departing from the spirit and scope of the invention. For example, it is within the scope of the present invention to combine the steps of the above-described methods to perform substantially the same function in substantially the same way to achieve substantially the same result. Accordingly, the scope of the invention is to be limited only by the following claims.

Claims (8)

1. An electronic invoice realization method based on a block chain is characterized by being applied to an electronic invoice system based on the block chain, wherein the electronic invoice system based on the block chain comprises a tax payment user terminal, a tax administration terminal, a block chain system and a block chain network;
the block chain system comprises block chain link points which are gradually increased in a chain generation mode, the block chain link points are connected in a chain mode, the block chain link points issue related information of interaction between the tax payment user side and the tax administration side and data information of each adjacent node in at least one target adjacent node to a block chain network, and the data information comprises secret key information and address information;
the block chain network comprises tax payment user nodes, tax bureau nodes, response nodes and information identification nodes, wherein the tax payment user nodes and the tax bureau ends carry out information interaction on the block chain system through the block chain network, the tax payment user nodes transmit data information of the tax bureau nodes through the block chain network, the response nodes feed back information sent to the tax payment user nodes by the tax bureau nodes, and the information identification nodes convert the information of the tax payment user nodes and the tax bureau nodes so that the tax payment user nodes and the tax bureau ends can identify the information of each other, and the method comprises the following steps:
(S1) the tax payment user applies for registration with the tax office: the tax bureau terminal generates a private key on the block chain system according to the requirement of the tax user, and generates a public key and an address through the generated private key; the address is used for storing invoice and inventory information of the tax payment user on the block chain system, the public key is used for verifying the identity of the tax payment user or encrypting data, the private key is used for encrypting identity verification information or decrypting data, and only the user with the private key can check corresponding plaintext data;
(S2) the tax office returns a private key to the tax payer: the tax user can inquire the invoice according to the address generated by the tax bureau end, and carry out identity authentication or decryption through a public key and a private key;
(S3) invoice purchase: the tax bureau side writes the invoice balance of the tax payment user into the block chain system and returns the invoice balance to the tax payment user side;
(S4) issuing an invoice: the tax payment user side inputs invoice data, encrypts the input data and uploads the encrypted data to the block chain system;
(S5) invoice query: inquiring invoice information according to the address and the private key of the tax payment user side;
the step of entering invoice data in the step (S4) includes:
(S41) generating electronic invoice information from the invoice content information;
(S42) generating the electronic invoice information into a PDF format;
(S43) generating a random password;
(S44) encrypting the data with a random password;
(S44) encrypting the invoice data with the random password;
(S45) encrypting the random password by using public keys of the tax bureau side and the tax payment user side;
(S46) inquiring the address of the tax client, and placing the invoice cryptograph and the key cryptograph on the addresses of the tax bureau and the tax client in the block chain system.
2. The block chain-based electronic invoice realization method according to claim 1, characterized in that: in the step (S1), the tax administration side is further connected to a CA server, and the tax administration side authorizes the electronic digital certificate through the CA server.
3. The block chain-based electronic invoice realization method according to claim 1, characterized in that: the method for generating the private key and the public key in the step (S1) is an elliptic curve encryption algorithm based on an encryption algorithm, and the specific method is as follows:
(S11) forming a private key by a random algorithm; randomly selecting 256 digits, selecting a random entropy source for the selected data according to an SHA256 algorithm, adopting hexadecimal identification if the private key displays 64 digits, and adopting dumpprivkey identification if the private key displays the private key by using bitcoin;
(S12) forming a public key from the private key according to an elliptic algorithm; the formula for generating the public key by the private key is that K (K) G K is the private key, G is a discrete constant point, and K is the public key;
(S13) forming an address of the tax user demand information based on the public key; the public key address of the tax user demand information starts with 1, and a is ripemmd 160(SHA256(K)), where K is the public key and a is the address of the tax user demand information, which is formed into a 20-byte address via Base 58.
4. The block chain-based electronic invoice realization method according to claim 1, characterized in that: the method for inquiring the invoice of the tax payment user side in the step (S2) includes: the tax paying user logs in an account on the block chain system through the tax paying user side, the tax paying user receives the data information of the tax bureau node transmitted by the block chain network by using the tax paying user node, and the data information of the tax bureau node is identified by the information identification node to obtain the information issued by the tax bureau side.
5. The block chain-based electronic invoice realization method according to claim 1, characterized in that: the method for writing the invoice balance of the tax user into the block chain system by the tax office in the step (S3) is as follows: logging in the account of the tax bureau terminal on the block chain system, acquiring invoice settlement information of the tax user by the tax bureau node through the block chain network, identifying the invoice settlement information by the information identification node, electronically signing the identified information by the tax bureau terminal, then releasing the signed information on the block chain system, and sending signing information to other block chain nodes by the block chain system through the block node of the block chain system.
6. The block chain-based electronic invoice realization method according to claim 1, characterized in that: the invoice query method in the step (S5) is as follows: the tax paying user firstly inquires invoice data belonging to the tax paying user according to the block chain address of the tax paying user, then analyzes the plaintext of the random key according to the private key, and then can analyze the plaintext of the invoice according to the random key, thereby obtaining the invoice data.
7. The block chain-based electronic invoice realization method according to claim 1, characterized in that: the block chain system further comprises a block chain bottom platform, and the block chain bottom platform adopts any one of a Hyperridge block chain technology platform or an Ethengfang block chain bottom platform.
8. The block chain-based electronic invoice realization method of claim 7, wherein: the Hyperleader block chain technology platform is a Linux fund meeting open-source super account book technology platform.
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