Proxy re-encryption method for multicast communication

Abstract

The invention provides a proxy re-encryption method for multicast communication, comprising the following steps: 1: the sender sets security parameters, and broadcasts the security parameters to all users; 2: independently selects a private key, and generates a public key according to the private key And make public the public key; 3: The sender performs hash function operation and bilinear pairing operation on the encrypted plaintext according to the security parameters and the public key of the agent to generate a first-level ciphertext; 4: The sender uses the security parameters and the proxy public key, generate a re-encryption key, and send it to the third-party agent; five: the third-party agent re-encrypts the first-level ciphertext according to the re-encryption key, generates a second-level ciphertext, and sends the second-level ciphertext to Agent; Six: The principal and the agent respectively decrypt according to the private key to obtain the plaintext. The invention can achieve the security of chosen ciphertext attack, and can be completely disclosed through the proxy re-encryption key, which is generated by the sender, which can resist collusion attack and improve the security of plaintext.

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.

Images