Improving Hybrid Cryptosystems with DNA Steganography

There exists a big demand for secure electronic communications while the expertise level of attackers increases rapidly and that causes even bigger demands and needs for an extreme secure connection. An ideal security protocol should always be protecting the security of connections in many aspects, and leaves no trapdoor for the attackers. Nowadays, one of the popular cryptography protocols is hybrid cryptosystem that uses symmetric and public key cryptography to change secret message. In available cryptography protocol attackers are always aware of transmission of sensitive data. Even noninterested attackers can get interested to break the ciphertext out of curiosity and challenge, when suddenly catches some scrambled data over the network. In this paper we discuss about the disadvantages of asymmetric algorithms in cryptography protocol. Furthermore, this paper proposes new cryptography protocol based on DNA steganography to reduce the usage of public cryptography to exchange session key. In this protocol session key between sender and receiver is hidden by DNA data hiding technique. Therefore, the attackers are not aware of transmission of session key through unsecure channel. Finally, the strength point of the DNA steganography is discussed.