A Family of Light-Weight Block Ciphers Based on DES Suited for RFID Applications

Dipl.-Kfm. Axel Poschmann, Gregor Leander, Kai Schramm, Chris­tof Paar

Workshop on RFID Security 2006, Graz, Austria, Juli 2006.


We propose a new block cipher, DESL (DES Lightweight extension), which is strong, compact and e?cient. Due to its low chip size constraints DESL is especially suited for RFID (Radio Frequency Identi?cation) devices. Our proposed DESL is based on the classical DES (Data Encryption Standard) design, however, unlike DES it uses a single Sbox 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 di?erential cryptanalysis, and the Davies-Murphy-attack.