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Erschienen in:
2018 | OriginalPaper | Buchkapitel
Optimization of AES and RSA Algorithm and Its Mixed Encryption System
verfasst von : Jia Liu, Chunlei Fan, Xingyu Tian, Qun Ding
Erschienen in: Advances in Intelligent Information Hiding and Multimedia Signal Processing
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Abstract
An improved key expansion method is proposed to improve the security performance in AES key expansion. There is large difference of operation time between Mixcolumns and Inverse Mixcolumns, we propose the simplest form of MixColumn and InvMixColumn operation on finite field \(GF(2^{N})\) which consumes same computing resources in the process of encryption and decryption. In terms of the defection of RSA operation efficiency, traditional double prime number is replaced by four prime number, Chinese remainder theorem combined with Montgomery modular multiplication is also presented to optimize modular exponentiation. On this basis, we adopt message digest, digital signature, digital envelope and other technologies to build a mixed encryption system which encompasses convenient key management and high-efficiency encryption and decryption, combined with the advantages of AES and RSA. The experimental results show that optimized algorithm has high speed and feasibility.