Define CIA triad. State the encryption process of double and triple DES. What is the task of S-Box in DES ? Discuss with an example.

Explain the generic model of digital signature process. Consider the two prime numbers 7 and 19. Select 29 as public key and 41 as private key. Encrypt the plaintext 4 and decrypt the cipher text 3 using RSA.

Define Galois field with an example. Explain any two modes of block cipher encryption. Deterimine the quadratic residues of 7.

What does intrusion mean? How the system detect intrusion? List any four types of firewall.

Decrypt the message “GVPJ” using Hill cipher taking the key as  {Row1 = 3  7, Row2= 5  12}.

Describe the PKI trust model.

Define authentication system. Illustrate the need of mutual authentication over one way authentication with an example.

Find the value of 7²⁰¹⁹ MOD 13 using Fermat’s Little theorem. Define Euler totient function with
an example.

List the properties of hash function. Discuss the first pass of MD4.

Differentiate between Symmetric and Asymmetric cipher. Encrypt the message “HELL” using
the key “FAIL” using Vernanm cipher.

Divide 3x² + 4x +3 by 5x +6 over GF(7).

Define SSL protocol. Mention the services provided by PGP.