Pipelined Sms4 Cipher Design for Fast Encryption Using Twisted BDD S-Box Architecture

In this current fast moving world, getting the information faster is more important. My project makes it happen. SMS4 cipher based on Pipelined Twisted BDD (Binary Decision Diagram) S-box architecture can convert the plain text into cipher text as fast as other S-box architecture. SMS4 is a 128-bit block cipher used in the WAPI standard for protecting data packets in WLAN. In this project S-box architecture using Look-Up Table (LUT), Twisted BDD and Pipelined Twisted BDD were compared and proved that Encryption using S-box Pipelined Twisted BDD architecture is about 3.5 – 4 times faster than other Sbox architectures. SMS4 is a symmetric key cipher, in which both the sender and the receiver use a single key for encryption and decryption. The decryption procedure of SMS4 can be done in the same way as the encryption procedure by reversing the order of the round keys. Keywords-SMS4 cipher; S-box; Twisted BDD architecture; Pipelined Twisted BDD architecture