tailieunhanh - A fast implementation of the rsa algorithm using the GNU MP library

Organizations in both public and private sectors have become increasingly dependent on electronic data processing. Protecting these important data is of utmost concern to the organizations and cryptography is one of the primary ways to do the job. | A FAST IMPLEMENTATION OF THE RSA ALGORITHM USING THE GNU MP LIBRARY Rajorshi Biswas Shibdas Bandyopadhyay Anirban Banerjee IIIT-Calcutta ABSTRACT Organizations in both public and private sectors have become increasingly dependent on electronic data processing. Protecting these important data is of utmost concern to the organizations and cryptography is one of the primary ways to do the job. Public Key Cryptography is used to protect digital data going through an insecure channel from one place to another. RSA algorithm is extensively used in the popular implementations of Public Key Infrastructures. In this paper we have done a efficient implementation of RSA algorithm using gmp library from GNU. We have also analyzed the changes in the performance of the algorithm by changing the number of characters we are encoding together we termed this procedure as bitwise incremental RSA . Key Words Cryptography RSA PKI GMP. 1. INTRODUCTION Data communication is an important aspect of our living. So protection of data from misuse is essential. A cryptosystem defines a pair of data transformations called encryption and decryption. Encryption is applied to the plain text . the data to be communicated to produce cipher text . encrypted data using encryption key. Decryption uses the decryption key to convert cipher text to plain text . the original data. Now if the encryption key and the decryption key is the same or one can be derived from the other then it is said to be symmetric cryptography. This type of cryptosystem can be easily broken if the key used to encrypt or decrypt can be found. To improve the protection mechanism Public Key Cryptosystem was introduced in 1976 by Whitfield Diffe and Martin Hellman of Stanford University. It uses a pair of related keys one for encryption and other for decryption. One key which is called the private key is kept secret and other one known as public key is disclosed. The message is encrypted with public key and can only

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