Secret key updating method, data decryption method and digital signature verification method

Abstract

The embodiment of the invention provides a secret key updating method, a data decryption method and a digital signature verification method. In the methods, a first secret key is generated after a reference value is subjected to one-way mapping processing of a first processing number of times, and a second secret key is generated after the reference value is subjected to one-way mapping processing of a second processing number of times, wherein the number of second processing times is smaller than the number of first processing times. According to the method, the first secret key is locally stored and used as the main secret key, when a secret key updating instruction is received, one-way mapping processing of the second processing times is carried out on the locally stored reference value, then the second secret key can be generated, the second secret key is used as a new main secret key, and updating of the main secret key can be completed. When information encrypted or signed by the first secret key is received, the first secret key can be obtained after one-way mapping processing is conducted on the second secret key, and then decryption or signature verification is conducted through the first secret key. Therefore, the updating of the key is realized, and the old key can be unidirectionally deduced according to the current key.

Description

technical field [0001] The present application relates to the technical field of information security, and in particular to a key update method, a data decryption method, and a digital signature verification method. Background technique [0002] In order to prevent data from being obtained by a third party during transmission, encryption technology is usually used to encrypt data to achieve data protection. Encryption technology includes two important factors: encryption algorithm and key. The encryption algorithm uses the key to process the data to be protected and obtain encrypted data. [0003] Transmitting encrypted data can prevent third parties from directly obtaining the data to be protected. However, due to various situations such as leakage or expiration of the key, the key needs to be updated in a timely manner. [0004] In related technologies, after the key is updated, the old key needs to be stored, so as to prevent data encrypted by the old key from being rec...

AI Technical Summary

Problems solved by technology

However, due to various situations such as key leakage or expiration, the key needs to be updated in a timely manner

[0004] In related technologies, after the key is updated, the old key needs to be stored, in case the data encrypted by the old key is received and cannot be decrypted

Therefore, the data transmission party needs to manage all the old keys. On the one hand, it occupies the hardware resources of the data transmission party. On the other hand, once the old key stored by the data transmission party is lost and cannot be restored according to the current key, it cannot Data encrypted with the old key is decrypted

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