Authenticated encryption method and encryption system based on symmetric encryption

Abstract

The invention discloses an authenticated encryption method and a system, relating to the field of communication security. The restorable signature of a message and the symmetric encryption technologyare combined; a commitment value which only can be calculated by a designated message receiving end is used as a session key encryption message; and the message receiving end validates the validity ofthe message by the restorable signature, thus realizing encryption and authentication in one logical step. A key generation unit of a sending end generates a session key of the sending end; an encryption unit encrypts a message to be sent; the receiving end generates a session key of the receiving end; a decryption unit utilizes the session key of the receiving end to decrypts the encrypted message; and the authentication and confirmation message is generated according to the decrypted message, thus validating the validity of the message. When disputes occur, the message receiving end transforms the authenticated and encrypted message signature into a common signature so as to lead a third party to validate the validity of the signature. The invention has the advantages of high security,low calculated amount and transmission cost, and the like.

Description

technical field [0001] The invention relates to the field of communication security, in particular to an authentication and encryption method in the communication process. Background technique [0002] With the development of computer and communication technology, more and more people use the network to transmit secret information, and the transmission of these secret messages often requires both confidentiality and authentication. The traditional way to realize authentication and confidentiality at the same time is to combine encryption and signature, and adopt the method of "sign first and then encrypt". The calculation and transmission costs of this combination are the sum of signature and encryption, and this traditional method uses public key encryption, the calculation speed is slow and the cost is high. The use of message recoverable signature technology can realize authentication and encryption at the same time at a lower transmission cost. Many scholars at home and...

AI Technical Summary

Problems solved by technology

However, the security of this scheme is not high, and it cannot resist the forgery attack of the message receiver, and after a dispute occurs, the third party cannot publicly verify the signature

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