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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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Q. In SDES, Encryption algorithm can be written as a composition of functions:

IP-1 o fK2 o fK1 o SW o IP

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Q. Assume input 10-bit key, K: 0010010111 for the SDES algorithm. What is K1?

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Q. The Plaintext for the Ciphertext 00001111, given that the key is 1111111111 is

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Q. The Plaintext for the Ciphertext 11110000, given that the key is 0000000000 is

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Q. Assume input 10-bit key, K: 0010010111 for the SDES algorithm. What is K2?

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