Authentication method by broadcast signature and ciphering

An authentication method and user key technology, which is applied in the field of broadcast signcryption authentication, can solve the problems of high computational cost, information confidentiality, authentication and non-repudiation, and information confidentiality and authentication. Separation and other issues

CN101505301BInactive Publication Date: 2012-05-23SHIJIAZHUANG RAILWAY INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2012-05-23
Estimated Expiration
Not applicable · inactive patent

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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.
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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...

Examples

Embodiment Construction

[0025] The present invention is described in further detail below in conjunction with accompanying drawing:

[0026] Different from the point-to-point information transmission method, the method of the present invention broadcasts the sign-encrypted video, audio, streaming media data and other message content to a specific user group through broadcasting, and the user decrypts the message through the key, and can To authenticate the message, its system structure is as follows figure 1 shown, where B 1 , B 2 ,......,B m For broadcast center, U 1 , U 2 ,......, U n For users (receivers), broadcast center B 1 and B 2 For example, B 1 message m 11 , m 12 , m 13 Respectively signcrypt broadcast to user U 1 , U 2 , U 3 , B 3 message m 31 , m 34 , m 36 Respectively signcrypt broadcast to user U 1 , U 4 , U 6 ; This broadcasting method can make full use of communication bandwidth, save costs, and greatly improve communication efficiency.

[0027] The broadcast si...