SVHF: A Lightweight Stream Cipher Based on Feistel and OFB

Abstract

For the demand of the resource constrained mobile terminal to the lightweight cipher, this paper presents a new lightweight stream cipher, which is based on the Feistel and OFB mode called SVHF. Similar to many other lightweight stream ciphers, the key-stream size of SVHF is 128-bit while the IV is specified to be 128 bits. Our security evaluation shows that SVHF can achieve enough security margin against known attacks, such as differential cryptanalysis, linear cryptanalysis and impossible differential cryptanalysis. Furthermore, SVHF can be implemented efficiently not only in hardware environments but also in software plat-forms. Hardware implementation of SVHF requires about 1632GE, which is comparable with the 2194 GE hardware implementation of WG-7. The software implementation of SVHF on 8-bit microcontroller is about 50.82 Mb/s, and its efficiency is 4 times as much as that of WG-7 in RFID environment.