Method and device for implementing digital signature

Abstract

The invention discloses a method and a device for implementing digital signature, which are used for ensuring accurate execution of algorithms when the digital signature is performed on data based on a hash algorithm and a digital signature algorithm with equal digits. The method comprises the following steps of: performing hash operation on the data to be signed according to the hash algorithm in accordance with specified digits; performing shrunken mapping on a hash result obtained through the hash operation to reduce the digits of the data contained in the hash result into the digits smaller than the specified digits; and performing digital signature operation on the mapping result according to the digital signature algorithm in accordance with the specified digits. Therefore, when the digital signature is performed on the data based on the hash algorithm and the digital signature algorithm with the equal digits, the condition that the hash result is greater than a signature modulus can be avoided so as to ensure the accurate execution of the digital signature algorithm. The invention discloses the device for implementing the digital signature at the same time.

Description

technical field [0001] The invention relates to data encryption technology, in particular to a digital signature realization method and device. Background technique [0002] At present, the public key cryptography algorithm has been widely used and popularized at a very fast speed. The public key cryptography algorithm includes two parts: the hash operation and the digital signature operation, and the digital signature operation is an important part of the application of the public key cryptography algorithm. In practical applications, when using the public key cryptography algorithm to digitally sign specified data, the hash algorithm must be used first to perform a hash operation on the signed data, and then preprocess the hash result (filling), and then use the public key cryptography to do the hash operation. The digital signature operation (hereinafter referred to as the signature operation) finally obtains the digitally signed encrypted data. [0003] In historical a...

AI Technical Summary

Problems solved by technology

[0006] When the 256-bit ECC signature algorithm and the 256-bit SHA256 hash algorithm are used in combination, the number of bits in the signature algorithm and the hash algorithm are equal, and there is a mismatch problem, because the 256-bit hash result has already made the subsequent There is no padding space for 256-bit signature operations, which is not conducive to improving the security of signature algorithms

Secondly, the value of the hash result may be greater than the ECC modulus, so that the correct signature operation cannot be performed

Images