In this paper we describe a new cryptosystem we call "The Hush Cryptosystem"
for hiding encrypted data in innocent Arabic sentences. The main purpose of
this cryptosystem is to fool observer-supporting software into thinking that
the encrypted data is not encrypted at all. We employ a modified Word
Substitution Method known as the Grammatical Substitution Method in our
cryptosystem. We also make use of Hidden Markov Models. We test our
cryptosystem using a computer program written in the Java Programming Language.
Finally, we test the output of our cryptosystem using statistical tests.Comment: 7 pages. 5 figures. Appeared in the 2nd International Conference on
Security of Information and Networks (SIN 2009), North Cyprus, Turkey;
Proceedings of the 2nd International Conference on Security of Information
and Networks (SIN 2009), North Cyprus, Turke
