Study on Various Encryption/Decryption Algorithms for Secure Communication using Chaotic based Hashed Key

In this paper, chaotic signal based hashed key generation for various encryption/decryption algorithms is investigated. Due to the merits of chaotic systems in secure communication, this paper proposes (i) chaotic sequence generation using Lorenz system and (ii) hashed chaotic key generation using Secure Hash Algorithm (SHA-256). Further, DES, triple DES, Blowfish and AES algorithms are used to encrypt/decrypt the message signal with the generated hashed chaotic key. To study the performance, simulation is conducted by considering (i) plaintext and (ii) ECG signal as the input signal. The performance of the encryption/decryption algorithms are compared using computational speed, encryption ratio and throughput.