In information security systems, the Broadcast Encryption (BE) scheme is important for guaranteeing secure multi-users communication in insecure channels, so it is widely studied in the world. Especially, BE scheme is a cryptographic primitive to achieve group communication such as video services.
Identity-based Encryption (IBE) technology is a new public key cryptographic primitive completely different from traditional ones. Extensively studied worldwide, it is expanding its application scope for its high utility.
A comprehensive survey of all the research results presents the main concerns in constructing (anonymous) Identity-Based Broadcast Encryption (IBBE) scheme as follows.
First, in the aspect of security requirement, it is preferable to achieve adaptive CCA security.
Second, in the aspect of performance evaluation, it is more desirable to obtain constant-size system public parameters, user secret key, ciphertext and decryption cost for IBBE schemes.
Third, in terms of computation efficiency, it is better to construct IBBE schemes based on prime order bilinear mapping and to have a small number of paring operation.
Forth, IBBE must satisfy anonymity.
Myong Kwang Min, a researcher at the Faculty of Information Science and Technology, based on the analysis of the characteristics of IBBE, has proposed an effective IBBE scheme with adaptive CCA security and anonymity and a small amount of paring operation by combining unforgeable digital signature scheme and IBE, and proved its security.
Through the performance comparison and computation evaluation, he has proved that the proposed scheme is superior to the previous one in terms of parameter size and computational amount while satisfying the adaptive CCA security and anonymity.
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