Publication Details

This article was originally published as Soldera, D and Seberry, J, The analysis of Zheng-Seberry scheme, in Proceedings of the Australasian Conference on Information Security and Privacy, ACISP'02, Batten, L and Seberry, J (eds), Lecture Notes in Computer Science, 2384, 2002, 159-168. Copyright Springer-Verlag. Original journal available here.


The Zheng-Seberry (ZS) encryption scheme was published in 1993 and was one of the first practical schemes that was considered secure against a chosen ciphertext adversary. This paper shows some problems that the semantic security of the one-way hash variant of the ZS scheme is insecure on some special circumstances. Attempts to modify the ZS scheme resulted on an El-Gamal variant that is provably secure in the random oracle model.