Agent re-encryption method used for group traffic

Abstract

The invention provides an agent re-encryption method used for group traffic. The method comprises the following steps: step one: a sender sets safety parameters and broadcasts the safety parameters to all users; step two: a private key is independently selected, and a public key is generated according to the private key and the public key is disclosed; step three: a Hash function operation and a bilinear pairing operation are performed on a clear text to be encrypted according to the safety parameters and the public key of a principal so that a first-level cipher text is generated; step four: a re-encryption secrete key is generated by the sender according to the safety parameters and the public key of an agent and the re-encryption secrete key is sent to the third part agent; step five: the first-level cipher text is re-encrypted by the third part agent according to the re-encryption secrete key so that a second-level cipher text is generated and sent to the agent; and step six: the principal and the agent are respectively decrypted according to the private key so that the clear text is acquired. According to the method, chosen cipher text attack safety can be achieved, the secret key can be completely disclosed via agent re-encryption and the agent re-encryption secret key is generated by the sender so that collusive attack can be resisted and safety of the clear text can be enhanced.

Description

technical field [0001] The invention relates to the field of data security communication, in particular to a proxy re-encryption method for multicast communication. Background technique [0002] With the development of wireless network technology, security group communication has become an important way of information exchange, and has a good application prospect in video conferencing, securities market release, digital content distribution and other occasions. In security group communication, there is usually one sender sending the same or different messages to multiple receivers. In order to ensure information security, the confidentiality and integrity of the sent message must first be ensured, that is, the content of the message cannot be stolen or tampered with by attackers who are not members of the communication group; The identity of the sender of the message; and forward security and backward security must be satisfied, that is, the receiver cannot obtain the conte...

AI Technical Summary

Problems solved by technology

The disadvantage of the first type of scheme is that as the size of the group members increases, the group controller will become a bottleneck

The disadvantage of the second type of scheme is that the calculation is complex and the delay is large, and it is difficult to apply to large-scale dynamic groups with frequent changes in membership.

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