Multicast security agent component and multicast encryption management method

Abstract

The invention relates to a multicast security agent component and a multicast encryption management method. The file encryption and decryption sub-module in the multicast module is a specific execution module for multicast users to perform message or file encryption / decryption, and adopts the RSA algorithm as the multicast encryption / decryption algorithm, the user's private key is used as the decryption key. After the system is authenticated, if some users on the intranet need to communicate in the group, the group key composed of the product of all members' private keys can guarantee the security of the multicast. When a user joins or an old user exits, by updating the group key, the newly joined user cannot access the communication content before joining and the exiting user cannot access the communication content after exiting, realizing one-key encryption in the multicast group. With the function of decrypting the key, when the group members change, there is no need to update the keys (private keys) of other users in the group. Forward secrecy, backward secrecy, and collusion resistance.

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 (key of a symmetr...

AI Technical Summary

Problems solved by technology

[0005] In the existing secure multicast technology, regardless of the use of symmetric (private key) encryption algorithms and asymmetric (public key) encryption algorithms, when a user joins or quits the group, the key in the group must be updated, so that the newly joined Users who log out do not have access to past communications, and users who log out do not have access to current and future communications

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