New Public Key System Based on ElGamal System
QU Pei-juan · Science Technology and Engineering · 2008
Based on ElGamal public key system, a new public key system in the form of polynomial on finite field is proposed. This system can resist attacks from each kind of chosen plaintext and chosen ciphertext actively, including IND-CCA2, and encrypt multi-files at one time. The system is based on the problem of discrete logarithm, its security rests in large part on the intractability of the problem of discrete logarithm on finite field. The mathematical intractability insures the private key non-attacked. The analysis shows that the scheme has high security and can be implemented easily.