Abstract: A new lightweight block cipher based on double pseudo random transform and Feistel structure called VHF was proposed for the demand of the resource constrained mobile terminal for the lightweight cipher.Similar to many other lightweight block ciphers,the block size of VHF is 128bit and the key size is 80bit and 128bit.Security evaluation of VHF shows that VHF can achieve enough security margin against known attacks,such as differential cryptanalysis,linear cryptanalysis,and impossible differential cryptanalysis etc.Furthermore,VHF can be implemented efficiently not only in hardware environments but also in software platforms such as 8bit microcontroller.The implementation efficiency of both software and hardware based on VHF is higher than CLEFIA algorithm,which is the international standard also oriented to 8bit platform.

Key words: Lightweight block cipher,Hardware efficiency,Cryptanalysis