Microcontroller Based Cryptosystem Using Rc4 Algorithm

RC4 is the most widely used stream cipher around. A lot of modifications of RC4 cipher can be seen in open literature. Most of them enhance the secrecy of the cipher and the security levels have been analyzed theoretically by using mathematics. In this paper, a new effective RC4 cipher is propose and the Security analyses has been done using Shannon’s Secrecy theories where numerical values are obtained to depict the secrecy. RC4 cipher proposed by Jagtap Suparna, Jadhav Mohini, Tupe Manisha, which were published prior to this work. Combination is done in such a way that the concept used in the modified RC4 algorithm is used in the Improved RC4 cipher. Importantly, an immense improvement of performance and secrecy are obtained by this combination. Hence this particular modification of RC4 cipher can be used in software applications where there is a need to improve the throughput as well as secrecy.