The Hush Cryptosystem
This addresses a specific security need for covert communication in Arabic, but appears incremental as it builds on existing methods like Word Substitution and Hidden Markov Models.
The authors tackled the problem of hiding encrypted data in innocent Arabic sentences to evade detection by observer-supporting software, achieving results validated through statistical tests.
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.