Q. Consider the cipher text message:

YJIHX RVHKK KSKHK IQQEV IFLRK QUZVA EVFYZ RVFBX UKGBP KYVVB QTAJK TGBQO ISGHU CWIKX QUXIH DUGIU LMWKG CHXJV WEKIH HEHGR EXXSF DMIIL UPSLW UPSLW AJKTR WTOWP IVXBW NPTGW EKBYU SBQWS

Relative Frequencies
3 7 2 2 5 5 7 9 11 4 14 4 2 1 3 4 6 5 6 5 7 10 9 8 4 2

The Index of Coincidence is

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Q. The plain text for the cipher text RRLMWBKASPDH. Given the encryption key
[(17 17 5 | 21 18 21 | 2 2 19)] is –

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Q. The Inverse S-box value for byte stored in cell (D,2)

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Q. Division of (131B6C3) base 16 by (lA2F) base 16 yeilds

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Q. In AES, to make the s-box, we apply the transformation –

b’i = bi XOR b(i+4) XOR b(i+5) XOR b(i+6) XOR b(i+7) XOR ci
What is ci in this transformation?

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Q. The inverse s-box permutation follows -

b’i = b(i+2) XOR b(i+5) XOR b(i+7) XOR di
Here di is –

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

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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 SDES, the Plaintext for the Ciphertext 00001111, given that the key is 1111111111 is,

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Q. A substitution cipher substitutes one symbol with

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Q. An asymmetric-key (or public-key) cipher uses

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Q. A straight permutation cipher or a straight P-box has the same number of inputs as

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Q. We use Cryptography term to transforming messages to make them secure and immune to

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Q. The man-in-the-middle attack can endanger the security of the Diffie-Hellman method if two parties are not

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Q. In Asymmetric-Key Cryptography, the two keys, e and d, have a special relationship to

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Q. The shift cipher is sometimes referred to as the

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Q. The substitutional cipers are

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Q. The heart of Data Encryption Standard (DES), is the

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Q. DES stands for

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Q. The cryptography algorithms (ciphers) are divided into

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