Multicast security agent assembly and multicast encryption management method

Abstract

The invention relates to a multicast security agent assembly and a multicast encryption management method. File encryption and decryption submodules in a multicast module serve as specific execution modules for multicast users to encrypt / decrypt messages or files, an RSA (Rivest-Shamir-Adleman) algorithm is adopted as a multicast encryption / decryption algorithm, and private keys of the users are taken as decryption keys. After system authentication, if some users in an intranet need intra-group communication, a group key formed by a product of the private keys of all the members can ensure multicast security; and when new users participate in the intranet or the old users exit the intranet, the new users can not access communication contents before accessing and the exited users can not access the communication contents after exiting through updating the group key, therefore, the functions of encryption with one key and decryption with multiple keys in a multicast group are realized. When group members change, the keys (namely the private keys) of the other users in the group do not need to be updated, thereby realizing the encryption on the multicast information, and achieving important forward secrecy, backward secrecy, inner attack resistance and the like in security multicast.

Description

technical field [0001] The invention belongs to the technical field of key management, and relates to a multicast security agent component and a multicast encryption management method. Background technique [0002] When the same message must be delivered to multiple receivers, multicast is a better communication model. Multicast communication reduces the overhead of the sender and the network medium. The application of encryption algorithms is a practical method for secure multicast communication over an unreliable network medium. Encryption algorithms are divided into symmetric (private key) encryption algorithms and asymmetric (public key) encryption algorithms. Symmetric encryption algorithm has fast encryption and decryption speed, high encryption strength, and difficult key distribution and management; asymmetric encryption algorithm has slow encryption and decryption speed and simple key management. [0003] For example, a session encryption key SEK (a key of a symme...

AI Technical Summary

Problems solved by technology

[0005] In the existing secure multicast technology, whether using symmetric (private key) encryption algorithm or asymmetric (public key) encryption algorithm , when a user joins or quits the group, the key in the group must be updated so that newly joined users cannot access past communication content, and exiting users cannot access present and future communication content

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