With the improvement of cryptanalysis technology, the RSA cryptographic algorithm has been continuously improved and widely used in information security fields such as data encryption, digital signature, and identity authentication. The algorithm has high encryption security, but there are still some shortcomings, such as: the speed is restricted due to the large number modular multiplication operation in the algorithm. This paper first introduces and analyzes the RSA encryption method in detail, and then gives an optimization method for its speed disadvantage. Keywords: RSA cryptographic algorithm; Chinese remainder theorem; Barret modular reduction algorithm Modern information security issues have become the focus of attention, and safe and fast encryption and decryption algorithms are increasingly favored by people. Therefore, RSA encryption and decryption operations have gradually become popular due to their security and ease of use, but speed has become its biggest flaw. Therefore, the high-speed implementation of the RSA algorithm is particularly important. In this case, the hardware chip with independent functions designed for the RSA algorithm has received widespread attention and huge investment due to its high-speed performance and the unique security advantages of the hardware itself. A lot of research has been done at home and abroad, and certain results have been achieved and related products have been put into use. At the same time, many scholars at home and abroad have also made good progress in the implementation research of RSA and its related algorithms. Combining the characteristics of the RSA algorithm, I optimized and implemented the RSA algorithm locally and achieved certain results.
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