| dc.description.abstract | As information technology has developed rapidly, it provides more convenient life for people. As the result, the security has become the main concern. Recently, user id and password are major methods to protect private information. However, the short password can be broken by hackers. Too long is not easy to memorize. Network traffic-analyzing tool provides the function to gain the user id and password while doing transaction via network. Therefore, low cost Smart Card including user name identification and cryptosystem algorithm has become new trend of
modern society.
The first object of this thesis is to present the design and implementati- on of a 512-bit RSA cryptosystem by using 8051 microcontroller. In RSA cryptosystem algorithm, modular exponentiation is the essential arithmetic operation. However, 8051 microcontroller does not provide the modular exponentiation. In order to complete RSA cryptosystem, this thesis has mentioned that using L-algorithm to transfer to modular multiplication.
Then using Montgomery to transfer addition and shift calculation.
The security of RSA cryptosystem relies on the comparative difficulty of factoring prime. Recently, physical cryptanalysis has become the new direction of cryptanalysis because it can attack the cryptosystem algorithm with careless design. Therefore, the second object of thesis focuses on SPA (Simple power analysis) and DPA (Differential power analysis). The main strategy to against SPA is to execute Montgomery Algorithm, no matter di is 1 or not. In addition, changing the private key is the method to against DPA. As the result, 512-bit RSA cryptosystem can become more safety and
reliable. | en_US |