A dynamic asymmetric key agreement for broadcast encryption based on braid groups

Abstract

Broadcast encryption is the scheme that a sender encrypts messages for a designated group of receivers, and sends the ciphertexts by broadcasting over the networks. Many research papers have done it using elliptic curve cryptosystem. This research proposes a dynamic asymmetric key agreement protocols for the broadcast encryption which is based on braid groups cryptosystem, an alternative method in the public key cryptography in which it can reduce the computational cost. The proposed scheme is also used the concept of an identity-based cryptosystem in order to reduce a system complexity and cost for establishing and managing a public key authentication framework. The scheme has some advantages over the other scheme in that the proposed scheme does not require a center for group key management, thus it is suitable for dynamic networks like mobile ad hoc networks in which group members can be dynamically changed all the time. The scheme also has a low computation cost in encryption and decryption processes and it makes a constant ciphertext