VLSI architecture design and implementation for TWOFISH block cipher

A novel VLSI architecture of the TWOFISH block cipher is presented. Based on the loop-folding technique combined with efficient hardware mapping, the architecture can make data encryption/decryption more efficient and secure. To demonstrate the correctness of our design, a prototype chip for the architecture has been implemented by using 0.35 /spl mu/m CMOS technology. The chip can achieve an encryption rate of 200 Mb/s and consume 44 mW while operating at a 66 MHz clock rate. Therefore, the chip can be applied to on-line encryption in high-speed networking protocols like ATM networks.