Anti-quantum-attack electronic signature method and anti-quantum-attack electronic signature system

Abstract

The invention provides an anti-quantum-attack electronic signature method and system, and the method comprises the steps: obtaining a signature application, and carrying out the identity verification of a signature applicant; receiving the electronic seal information and the to-be-signed document, generating electronic signature document information, calculating a ciphertext and a message authentication code of the electronic signature document information by using the shared key, and feeding back the corresponding ciphertext and the message authentication code to a signature applicant for decryption to obtain the document; calculating a message digest of the electronic signature document information, calculating an authentication code of the message digest by using another shared key, sending the message digest and the authentication code to a third party for verification, waiting for a verification result of the third party and a comparison result of the third party on the document and the message digest, and when the verification result and the comparison result pass, sending the electronic signature document information to the third party; the signature applicant obtains the electronic signature information after the third party carries out the symmetric key digital signature; according to the method, the calculation complexity is reduced, and meanwhile, the quantum aggression resistance can be ensured.

Description

technical field [0001] The invention belongs to the technical field of encrypted communication of a quantum cryptographic network, and in particular relates to an electronic signature method and system for resisting quantum attacks. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] With the rapid development of information technology, in order to improve the reliability and convenience of online information, electronic signatures came into being. An electronic signature is not a digital image of a written signature and seal, it exists in the form of an electronic code. With electronic signatures, recipients can transmit documents over the network and can easily verify the sender's identity and signature. It also verifies that the original text of the document has not changed during transmission. Electronic signatures help to identify the i...

AI Technical Summary

Problems solved by technology

In the face of the foreseeable research and construction of quantum computers, cryptographic systems based on computational complexity are not safe, and there are high security risks

[0005] According to the inventor's understanding, some researchers also want to improve the above problems. However, the current improvement methods mostly adopt relatively complicated signature or encryption methods. For example, the patent document of CN109560935A provides a kind of anti-quantum based on public asymmetric key pool. The computational signature method and the signature system use the anti-quantum computing public key generated by the seal public key combined with the asymmetric key pool in the key card, and hide the public key of the seal by disclosing the anti-quantum computing public key to realize the electronic signature. Anti-quantum computing characteristics, but in the signature encryption method it provides, it uses one RSA signature, one symmetric encryption and one RSA encryption, and the calculation amount is about twice that of the ordinary RSA signature method

Similarly, the amount of calculation involved in decrypting and verifying the signature is about twice that of the normal verification method. Signature and verification involve a large amount of calculation, which affects the amount of communication data and efficiency

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