Hybrid Implementation of Twofish, AES, ElGamal and RSA Cryptosystems

Nowadays, for achieving information security and to provide security against unauthorized access cryptography plays an important role. To ensure high-security level there are different types of cryptographic methods. This paper presents implementation and analysis of new hybrid cryptosystems. Main objectives of this paper are to emphasize on better performance, maximum speed of an algorithm, checking effectiveness and comparison with other algorithms. In the paper is proposed two new hybrid algorithms using combination of both symmetric and asymmetric cryptographic algorithm such as Twofish, AES, RSA and ElGamal. To analyze results was used JAVA program implementation. The results shows that the proposed hybrid algorithm AES+RSA is significantly secure. However, Twofish + RSA hybrid has other advantages like better computation time, the size of cipher text, and the memory consumption.