New Light-Weight Crypto Algorithms for RFID

The authors propose a new block cipher, DESL (DES Lightweight extension), which is strong, compact and efficient1. Due to its low area constraints DESL is especially suited for RFID (Radio Frequency IDentification) devices. DESL is based on the classical DES (Data Encryption Standard) design, however, unlike DES it uses a single S-box repeated eight times. This approach makes it possible to considerably decrease chip size requirements. The S-box has been highly optimized in such a way that DESL resists common attacks, i.e., linear and differential cryptanalysis, and the Davies-Murphy-attack. Therefore, DESL achieves a security level which is appropriate for many applications.