Anonymous anti-quantum computing digital currency double-offline transaction method and system for money issuing party

Abstract

The invention discloses an anonymous anti-quantum computing digital currency double-offline transaction method and system for a money sending party. The method comprises the following steps: S1, a preparation stage: issuing a private key based on ID cryptography, an anti-quantum computing digital currency and a digital certificate to a money sending party terminal / a receiving party terminal respectively; s2, a double-offline transaction stage: the money sending party terminal and the receiving party terminal complete the double-offline transaction in an offline state through an offline transaction method; and S3, an online transaction stage: confirming the transaction through the commercial bank and the central bank in an online state. The beneficial effects of the invention are that the digital currency equipped with the private key is designed, a digital currency double-offline transaction method for anonymity of the money sending party can be realized, and the identity information of the money sending party is protected and is not exposed; various transactions including double offline transactions among the digital currencies can be carried out by the method disclosed by the invention; and anti-quantum calculation can be realized.

Description

technical field [0001] The invention relates to the field of digital currency, in particular to a method and system for double-offline transaction of anti-quantum calculation digital currency with the sender anonymous. Background technique [0002] As most people understand, quantum computers have great potential for code-breaking. Today's mainstream asymmetric (public key) encryption algorithms, such as the RSA encryption algorithm, are mostly based on the two mathematical problems of factorization of large integers or calculation of discrete logarithms on finite fields. The difficulty of their cracking also depends on the efficiency of solving these problems. On traditional computers, it takes exponential time to solve these two mathematical problems (that is, the cracking time increases exponentially with the length of the public key), which is unacceptable in practical applications. However, Shor's algorithm tailored for quantum computers can perform integer factorizat...

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Problems solved by technology

[0005] Patent CN201911053809 proposes an anonymous transaction method and system based on digital currency, but there are some problems in this method and system: only online transactions can be performed, and the user's temporary identity can only be followed by the subsequent transaction process when it is approved by its own server , when the user cannot communicate with its own server, the payee of this method cannot use the user's temporary identity to verify its digital signature on the transaction (in the mathematical signature based on digital certificates, because the user needs to hide the real identity, it cannot Provide a digital certificate containing its real identity, and cannot prove the association between its temporary identity and its digital certificate, so it cannot use its digital certificate to verify its digital signature on the transaction; in the mathematical signature based on ID cryptography, because the user needs hides its real identity, so it cannot provide its real identity, and cannot prove the association between its temporary identity and real identity, so it cannot use its real identity to verify its digital signature on the transaction), so the payee does not receive the sent It is impossible to recognize the legitimacy of this transaction and complete the entire transaction process without any identity certificate of the payer

[0007] 1. Most existing digital currency transaction methods based on digital certificates or user IDs expose user identities;

[0008] 2. The existing digital currency anonymous transaction methods based on digital certificates or user IDs can guarantee the anonymous identity of users but cannot conduct anonymous transactions in which both the sender and the payee are offline (that is, double offline);

[0009] 3. Existing digital currency transaction methods cannot resist quantum computing

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