Key exchanging method based on public key certificate

Abstract

The invention relates to a method of changing secret keys based on shared key certificates. It is a method of shared certificate and digital signature based on discrete logarithms in large prime number area and Diffie-Hellman secret key changing agreement, and with collision resist different functions. It is safe with a fast calculation speed, which has been proved.

Description

technical field [0001] The invention relates to a key exchange method for confidential or secure communication, in particular to a key exchange method based on public key certificates. Background technique [0002] Cryptographic algorithms and communication protocols with provable security are an important and difficult research topic in cryptography. The research on communication security and confidentiality revolves around finding stronger and better cryptosystems. Because the traditional cryptographic system uses a single key for encryption and decryption, once the encryption key is leaked, the entire cryptographic system will lose its function. Therefore, more and more defects have been exposed in practical applications, but because the encryption speed of the symmetric key system is much faster than that of the public key encryption, it has advantages in encrypting a large amount of data. Therefore, a hybrid encryption method is produced, whic...

AI Technical Summary

Problems solved by technology

But the EKE protocol has a serious flaw, it requires both parties to know a shared password P, which greatly limits the scope of communication