Robust Broadcasting Cryptosystem in Computer Networks

In 2008, Zhu-Wu showed that the redefined Liawpsilas broadcasting cryptosystem is still insecure in that an unauthorized user is able to obtain the shared secret, which is only intended for certain privileged users. However, Zhu-Wu did not provide an improvement of the redefined Liawpsilas broadcasting cryptosystem. In addition, we found that the redefined Liawpsilas broadcasting cryptosystem has another security problems. Therefore, this paper proposes a new broadcasting cryptosystem that can withstand Zhu-Wupsilas attack and our proposed attacks. The proposed cryptosystem not only has still advantages of the redefined Liawpsilas broadcasting cryptosystem, but also is more secure compare with previous related broadcasting cryptosystems.