ISEC312_UGQ2_S01

Matrix multiplication can be done between A - 2 × 3 matrix and B - 3 × 4 matrix

• True

• False

The resistance of the cipher to attack must be based only on the secrecy of the plaintext.

• True

• False

In ____________attack, the attacker/cryptanalyst can select or choose the plaintext that is sent through the encryption algorithm and observe the ciphertext that it generates.

• Known Plaintext Attack

• Chosen Plaintext Attack

• Chosen Ciphertext Attack

• Ciphertext only

In monoalphabetic substitution, the relationship between a symbol in the plaintext to a symbol in the ciphertext is always _________

• many to many

• one to one

• one to many

• many to one

Perform Cryptanalysis of Additive Cipher and determine the key with the ciphertext “XQJUDGHGTXLC”.

(a)  

Perform encryption for Multiplicative cipher with “is” as plaintext and key as 11.

(a)  

Perform decryption for Affine cipher with “QP” as ciphertext and key as k1 = 5 & k2 = 2.

(a)  

Perform encryption for Autokey cipher with “tool” as plaintext and key as 1.

(a)  

Perform decryption for Playfair cipher with “BQQBPFCD” as ciphertext and keyword as “ciphers”

(a)  

Perform decryption for Vignere Cipher with “mbnx” as ciphertext with keyword as “at”.

(a)