Network Security — Summer 2020

1. Explain any three challenges of computer security. (3) 2. Explain a model for network security in detail. (4)

1. Explain the use of random and pseudorandom numbers in encryption. (5) 2. Write any two advantages of counter mode. (2)

What is the need of hash function? Explain steps of SHA-512 algorithm with suitable diagram.

Explain RSA public key cryptography algorithm taking suitable example. Show encryption and decryption process for example.

Explain AES symmetric encryption algorithm in detail with suitable diagram.

1. Explain KDC and its operations. (4) 2. Explain the role of TGT, TGS and AS with respect of kerberos V4. (3)

Explain SSL record protocol in detail with suitable diagram.

1. Explain the use of public key certificates. (2) 2. Explain X.509 V2 certificates in detail. (5)

Explain pseudorandom function and cryptographic computations for TLS with suitable diagram.

Explain 802.11 protocol architecture in detail using suitable diagram.

Explain the two reasons to grow PGP explosively. (2) Explain confidentiality and authentication operation of PGP using suitable diagram. (5)

Explain ESP packet format in detail using suitable diagram.

Explain different fields associated in general format PGP message with diagram.

1. Differentiate between transport mode SA and tunnel mode SA functionality for AH, ESP and ESP with authentication. (3) 2. Explain classes of intruders. (4)

Explain the types of firewall in detail using suitable diagram.

Explain the three parts and four phases of computer virus.

Explain password selection strategies in detail.