Identity based broadcast encryption scheme against selective opening attack

Abstract

Recently Sun Jin,et al.proposed an dentity-based broadcast encryption scheme against selective opening attack,(SUN JIN,HU YU-PU.Identity-based broadcast encryption scheme against selective opening attack.Journal of Electronics and Information Technology,2011,33(12): 2929-2934) and it claimed that the scheme can fight against Selective-Opening Attack(SOA) and has constant-size key and ciphertext in the standard model without random tags.However,this paper proved that their proposal cannot work at all.Furthermore,the authors improved their scheme to be a correct one,and then proved its security in the standard model.