Function Modular Design of the DES Encryption System Based on Reversible Logic Gates

Encryption system demands not only high security but low power consumption. Reversible logic arose more and more attention in the recent past due to its less heat dissipating characteristics. This paper analysis the functional module of DES system, then presented a 4:1 mux based on reversible logic gates, and designed respectively a reversible circuit of a 4-bit counter and a reversible circuit of two-way shift register. By using a series of reversible device, we realized the design of reversible circuits for the functional modules.