Information Security Question Paper

Subject: Computer and Information Security Course: M.Sc. Tech ITM Duration: 90 Minutes Max. Marks: 50

1. Briefly explain - a. classification of crypt analysis attack. B. DES algorithm in detail (10+10 =20 Marks)

2. Explain RC4 algorithm. Encrypt the Message “HI” using RC4 algorithm, with four states and 2 bit key values are [2,5] ASCII value for H – 1001000I – 1001001 (5+5=10 Marks)

3. a. Find the plaintext from the ciphertext using cesar cipher – VSRQJHEREVTXDUHSDQWU b. Encipher “CHUCK NORRIS IS A TOUGH GUY” using a rail fence cipher. c. Decipher “JYENR BOALR ERIIE LOLAR ISNDE TLYRC ACIFB PE” using a simple 4 column transposition. (2.5+ 2.5+5 =10 Marks ) (P.T.O)

Subject: Computer and Information Security Course: M.Sc. Tech ITM Duration: 90 Minutes Max. Marks: 50

1. Briefly explain - a. classification of crypt analysis attack. B. DES algorithm in detail (10+10 =20 Marks)

2. Explain RC4 algorithm. Encrypt the Message “HI” using RC4 algorithm, with four states and 2 bit key values are [2,5] ASCII value for H – 1001000I – 1001001 (5+5=10 Marks)

3. a. Find the plaintext from the ciphertext using cesar cipher – VSRQJHEREVTXDUHSDQWU b. Encipher “CHUCK NORRIS IS A TOUGH GUY” using a rail fence cipher. c. Decipher “JYENR BOALR ERIIE LOLAR ISNDE TLYRC ACIFB PE” using a simple 4 column transposition. (2.5+ 2.5+5 =10 Marks ) (P.T.O)

Subject: Computer and Information Security Course: M.Sc. Tech ITM Duration: 90 Minutes Max. Marks: 50

1. Briefly explain - a. classification of crypt analysis attack. B. DES algorithm in detail (10+10 =20 Marks)

2. Explain RC4 algorithm. Encrypt the Message “HI” using RC4 algorithm, with four states and 2 bit key values are [2,5] ASCII value for H – 1001000I – 1001001