In Mobile Communication Based On Chaos Of Aes Algorithm Research

With the rapid development of computer network technology and mobile communication technology as well as the widely used of public information system in commercial fields, information has become an important wealth in people’s daily lives. The popularity of smart phones has brought great convenience for people’s communication. Mobile communication security is related to personal privacy and commercial secrets, and even national security, so the encryption for smart phone information is particularly important.AES encryption algorithm has been the most widely used encryption algorithm at present. This algorithm uses the Square structure and a special S-box design, so it has a strong resistance to differential cryptanalysis and linear cryptanalysis.So after release; it has been widely used in various fields of social life. But the AES algorithm researched by cryptographist shows that Square attacks and power analysis method have a great threat to the round keys of the AES algorithm, so it is necessary to improve the key expansion part of the algorithm. Chaotic system is very sensitive to the initial value and ergodicity on the set of real numbers as well as long-term unpredictability, thus the chaotic sequence has good cryptographic properties. The combination with chaotic sequence and the AES algorithm can effectively compensate for the deficiencies of the original AES algorithm.The main content of this paper fused chaotic sequence with the AES algorithm, and proposed an encryption algorithm suited for Android mobile phone platform.The improved algorithm kept the frame of the original AES,using the key which generated by Logistic map and Lorenz system XOR,and simplifying the iterative rounds of the AES encryption,so this algorithm can improve the encryption efficiency.Also this paper developed a secure communication software which can be used on the Android phones on the basis of this algorithm.This software can set passwords autonomously and transmit voice and text information secretly between two mobile phones.According to the practical test result, the key space of the improved algorithm has been significantly increased.Due to its one-time pad encryption, the security has been greatly improved.So this algorithm can make up for the shortcomings in the original AES algorithm.Test of the software on the Android platform showed that this software has the advantages of good security, fast speed as well as preferable reliability, so it has some practical values.