El Gamal Cryptosystem

This presentation contains the contents pertaining to the undergraduate course on Cryptography and Network Security (UITC203) at Sri Ramakrishna Institute of Technology. This covers the ElGamal Cryptosystem.

1. ElGamal Cryptosystem Adri Jovin J J , M.Tech ., Ph.D. UITC203 CRYPTOGRAPHY AND NETWORK SECURITY

2. ElGamal Cryptosystem UITC203 CRYPTOGRAPHY AND NETWORK SECURITY 2 Global Public Elements prime number and is a primitive root of   Key Generation by Alice Select private Calculate Public key Private key  

3. Elgamal Cryptosystem ( Contd …) UITC203 CRYPTOGRAPHY AND NETWORK SECURITY 3 Encryption by Bob with Alice’s Public Key Plain text Select random integer Calculate Calculate Calculate Ciphertext   Decryption by Alice with Alice’s Private Key Ciphertext Calculate Plain text  

4. Problem UITC203 CRYPTOGRAPHY AND NETWORK SECURITY 4

5. References Schneier , B. (2007). Applied cryptography: protocols, algorithms, and source code in C. John Wiley & Sons. Stallings, W. (2014). Cryptography and network security, 6/E. Pearson Education India. Katz, J., & Lindell, Y. (2014). Introduction to modern cryptography. CRC press. UITC203 CRYPTOGRAPHY AND NETWORK SECURITY 5