Authentication method by broadcast signature and ciphering

Abstract

The invention discloses a broadcast signcryption authentication method, which comprises the following steps that: 1) system parameters are set; 2) a broadcast center calculates public key signature according to the parameters, and uses a user secret key to encrypt message to be broadcasted; 3) the broadcast center broadcasts the encrypted message acquired in step 2) to a user group; and 4) the user receives the encrypted message broadcasted in the broadcast center, uses a private key to decrypt the signature and verifies the validity of the signature. The method carries out two-layer confidential encapsulation of signature and encryption for the message, and broadcasts and mass-sends different messages to a group of users in once broadcast; and only specific authorized users can receive the designated message; therefore, the method has high-strength information confidentiality, signcryption information unforgeability and signcryption information non-repudiation. The method can regulate legal user groups at any time according to actual demand, but does not need to newly distribute new shared secret keys, has high flexibility, can make full use of communication bandwidth, saves cost, and greatly improves the communication efficiency.

Description

technical field [0001] The invention relates to the field of information broadcast communication, in particular to a broadcast signcryption authentication method. Background technique [0002] With the rapid development of modern society, broadcast encrypted transmission of media information has become an important information sharing method, which allows information senders to transmit encrypted data to a group of receivers, and only specific authorized users can decrypt and obtain information. This broadcast encryption authentication technology has broad application prospects, such as paid cable TV system, video and audio network broadcast, video conference and securities real-time market release and other occasions have good application prospects. [0003] Usually, the confidentiality of data is realized through encryption, and the authentication is realized through digital signature. In the traditional signature-encryption method, the information sender implements the e...

AI Technical Summary

Problems solved by technology

This research mode almost directly applies a single information signcryption transmission method to the broadcast system, which will inevitably bring about major limitations, such as high calculation costs, excessive transmission and communication costs, and separation of information confidentiality and authentication.

Especially in the one-time broadcast process, the simultaneous realization of information confidentiality, authentication and non-repudiation functions has not been fundamentally resolved

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