Symmetric key generation method and system based on public key and private key

Abstract

The invention provides a symmetric key generation method and system based on a public key and a private key, and the method comprises the steps: generating a string of random numbers, directly employing an encryption end to carry out the encryption of the random numbers for a plurality of times, obtaining symmetric keys, and enabling the symmetric keys to be distinguished and stored in a value block chain; according to the data type and the data structure of the to-be-encrypted information, selecting a proper symmetric key to convert the to-be-encrypted information into encrypted information; and finally, after the private key from the user terminal is verified, the verified private key is matched with the symmetric key of the encrypted information, a corresponding information decryption result is fed back to the user terminal according to the matching result, the symmetric key generated after the random number is encrypted for multiple times is used as a public key, and then the public key is matched with the private key of the user terminal, so that the information decryption efficiency is improved. In this way, multiple times of interaction between the encryption end and the decryption end can be omitted, the complexity of key transmission is reduced, and the efficiency and reliability of information encryption are improved.

Description

technical field [0001] The present invention relates to the technical field of key generation and management, in particular to a method and system for generating a symmetric key based on a public key and a private key. Background technique [0002] At present, the transmission of symmetric keys is very complicated. It first needs to generate a random number as the symmetric key VEK, match a corresponding version number VKEK_version, encrypt the symmetric key VEK to obtain the private key VKEK, and then combine the private key VKEK and The version number VKEK_version is transmitted together. The above method of generating and transmitting the symmetric key requires multiple interactions between the encryption end and the decryption end to complete the complete generation and transmission of the symmetric key, which not only consumes a lot of time and labor costs, but also reduces the generation efficiency of the symmetric key. SUMMARY OF THE INVENTION [0003] In view of t...

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Problems solved by technology

[0002] At present, the transmission of symmetric keys is very complicated. It first needs to generate random numbers as the symmetric key VEK, and at the same time match a corresponding version number VKEK_version, and encrypt the symmetric key VEK to obtain the private key VKEK. Then, the private key VKEK and The version number VKEK_version is passed together

The generation and transmission of the above-mentioned symmetric key requires multiple interactions between the encryption end and the decryption end to complete the complete generation and transmission of the symmetric key, which not only consumes a lot of time and labor costs, but also reduces the generation efficiency of the symmetric key

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