Q. In the DES algorithm, although the key size is 64 bits only 48bits are used for the encryption procedure, the rest are parity bits.

View solution

Q. In the DES algorithm the round key is __________ bit and the Round Input is ____________bits.

View solution

Q. In the DES algorithm the Round Input is 32 bits, which is expanded to 48 bits via ____________

View solution

Q. The Initial Permutation table/matrix is of size

View solution

Q. The number of unique substitution boxes in DES after the 48 bit XOR operation are

View solution

Q. In the DES algorithm the 64 bit key input is shortened to 56 bits by ignoring every 4th bit.

View solution

Q. During decryption, we use the Inverse Initial Permutation (IP-1) before the IP.

View solution

Q. A preferable cryptographic algorithm should have a good avalanche effect.

View solution

Q. The number of tests required to break the DES algorithm are

View solution

Q. The number of tests required to break the Double DES algorithm are

View solution

Q. How many keys does the Triple DES algorithm use?

View solution

Q. In triple DES, the key size is ___ and meet in the middle attack takes ___ tests to break the key.

View solution

Q. Using Differential Crypt-analysis, the minimum computations required to decipher the DES algorithm is

View solution

Q. Using Linear Crypt-analysis, the minimum computations required to decipher the DES algorithm is

View solution

Q. What is the size of the key in the SDES algorithm?

View solution

Q. Assume input 10-bit key, K: 1010000010 for the SDES algorithm. What is K1?

View solution

Q. Assume input 10-bit key, K: 1010000010 for the SDES algorithm. What is K2?

View solution

Q. The Ciphertext for the Plaintext 01110010, given that the keys K1 is 10100100 and K2 is 01000011 is

View solution

Q. The Ciphertext for the Plaintext 11010101, given that the key is 0111010001 is

View solution

Q. The Plaintext for the Ciphertext 00100010, given that the key is 1111111111 is

View solution