What is security services? Explain four fundamental security design principle. [1+4]
What do you mean by transportation cipher? Decrypt the cipher text UIESTNVRIY using the Rail fence cipher using rail size is 2. [2+3]
What is Euler's totient function? Find multiplicative inverse of 87 in Z₁₀₀ using Extended Euclidean algorithm. [1+4]
What is Abelian group? Find whether 561 is prime or not using Miller-Rabin algorithm. [2+3]
What is Password aging? Explain process of biometric authentication. [1+4]
What is malicious software? How worms are different from Trojan horses? [1+4]
What is security Audit? Explain the architecture of security auditing. [1+4]
Attempt any TWO questions
[2x10=20]How key generation, encryption and decryption is done in RSA. In a RSA cryptosystem, given p=5 and q=19, determine private key, public key and perform encryption and decryption for the message m=4. [5+5]
Explain properties of hash functions. How hash value is generated using SHA-1 algorithm, explain with suitable diagram. [3+7]
What is difference between Access Control List (ACL) and Access Control Matrix (ACM)? Explain five services provided by PGP protocol to secure email. [5+5]