Design And Realization Of Lightweight Block Cipher ESF

With the development of low resource devices such as RFID tags, sensor nodes, smart cards,protection of privacy and so on, which are regarded as critical technologies in digital informationsociety based on hardware and Internet, however resource-efficient cryptographic primitives areextremely critical on performance for security and efficiency in wireless communication andembedded systems. It has been applied in many directions of our life. Lightweight cryptographyhas become a hot pot, research on designing and analyzing lightweight block ciphers haveattracted a lot of attention. In fact, the applications of these technology have some properties,such as small storage space, weak computation ability, extremely power constraints etc. However,conventional algorithms such as AES although quite secure, are not suitable for extremelyconstrained environments. The filed of lightweight cryptography deals with designing ciphers forsuch environments.In this paper, we present a new lightweight block cipher named Eight-Sided Fortress (ESF),which is suitable for resource-constrained environments such as sensor networks and low-costRFID tags. The encryption algorithm of ESF is based on variant Feistel structure with SPNround function. ESF is64bits block length and key size is80bits. We search for the impossibledifferential characteristic of ESF using the impossible differential cryptanalysis, and present animpossible differential cryptanalysis on11-round improved ESF, which is based on the following8-round impossible differential. the time complexity of the attack is about275.511-roundencryptions. According to the complexities of impossible differential attack on11-round ESF, Itconclude that the full32-round ESF has enough security margin against this attack. Thehardware implementation of ESF requires about1300gates on0.18μm technology.Hardware implementation with high safety and remarkable compactness. The softwareenvironment implementation by software programming, it has the characteristics of highefficiency, low ability of computer, storage space etc.. There are still many problems to bestudied in the next step of work: The impossible differential cryptanalysis method is applied toattack more rounds of the ESF algorithm; The other classic cipher cryptanalysis method is applyto attack ESF algorithm; Learning new cipher cryptanalysis method to analysis the security ofESF algorithm.