The Research On Hybrid Encryption Algorithm Based On AES And ECC

With information globalization,information security problem have become a key concern and research objects in various fields,ranging from national defense confidential information to small company internal information data.The confidentiality of information needs to be guaranteed.The globalization of information has now brought a great degree of influence on politics,military and economy.Countries all over the world are following the pace and stepping up the construction and improvement of information security issues.In this context,the thesis has achieved a complementary design by combining the improved AES algorithm with the ECC algorithm to obtain a new hybrid encryption scheme.The main research work of this thesis is as follows:(1)This thesis studied the AES algorithm and the ECC algorithm,analyzed the design principles and encryption process of these two algorithms,and analyzed and compared them.As a symmetric cryptographic algorithm,AES has fast calculation speed,flexible design of grouping and key length,but it has the defect of difficulty in key storage,management and distribution.As an asymmetric cryptographic algorithm,ECC not only has high security,but also solves the problem of AES key management,but it is not suitable for encrypting big data messages.(2)In this thesis,the S-box,the only non-linear component in the AES algorithm,has improved its algebraic characteristics to varying degrees.By compared and analyzed the optimized S-box,the affine conversion period was increased to a peak value of 16,which was enough to resist some common attack methods.The output period had been optimized to 256.The length of algebraic expression of the reconstructed S-box and inverse S-box was increased to 253 and 254 respectively.And the avalanche effect of the improved S-box was closer to 0.5 than the initial S-box.At this time,the average value of the avalanche effect is about 0.5046,which improves the overall security of the algorithm.(3)Proposed a hybrid encryption algorithm model combining AES and ECC,which mainly utilized the combination of the advantages of AES algorithm and ECC algorithm to form a complementary design.And studied the relevant principles of digital signatures,and used ECDSA to realize digital signatures and signature verification,which ensured the integrity of the transmitted data.(4)Designed and realized a hybrid encryption algorithm based on AES and ECC.This scheme conforms to the encryption mechanism of Internet communication,can effectively reduced the risk in the data transmission process,and achieved high efficiency and confidentiality.Finally,the improved hybrid cryptographic algorithm had been simulated and tested,and its reliability was verified from the perspective of security and efficiency.