Block Cipher Based On Integer Chaotic Map For The Wireless Sensor Networks

With the continuous development of wireless sensor network, security has become a key problem that constraint it in many cases of application. Data encryption is an indispensable part of wireless sensor network security mechanism; however the traditional encryption algorithms are not applied to the nodes in WSN nodes with less energy, low computing power and limited storage resources. Since chaotic maps are highly nonlinear, unpredictability, pseudo-random and sensitivity to the parameters, based on chaotic mapping to design a new efficient and less resource-intensive data encryption method has become a possibility.First, this paper introduces an overview of the cryptography system, the basis of chaotic cipher theory, traditional and chaotic WSN block ciphers, and shortages of them. Then this paper introduces a concept integer chaotic map, and use different perturbation method to improve the integer chaotic map problem:short cycles, with such method, integer chaos retains the highly nonlinear, sensitivity, pseudo random. Then the paper uses the integer chaotic to make S-BOX of good performance, key generators, and the core function in feistel structure. Finally, based on the various components of block cipher that constructed above, this paper comes up with two types of new block encryption algorithm.Two kinds of algorithms are both based on the integer chaos and feistel network structure. One type is the core function of the feistel structure is the dynamic changeable S-BOX, another type is the core function is integer chaos map with perturbation, which has high nonlinearity. A large amount of data test shows that two kinds of encryption algorithms not only have good statistical properties, sensitive characteristics to plaintext and key, but also occupy less resources, execute faster in the simulation platform. So the proposed algorithm can be well used for WSN data encryption.