Q. Determine the value of x, where y = 7, e = 12 and n = 566 using modular exponentiation method (x ≡ yᵉ (mod n)).

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Q. How many bytes of the secret key is generated using Diffie-Hellman encryption/decryption scheme?

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Q. In which of the following systems, encryption slower than decryption?

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Q. If there are 2⁵⁶ cipher texts per plain text and a total of 2¹⁸ plaintexts of length 18 exists. Then determine the number of distinct ciphertexts?

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Q. TEA cipher uses which of the following structure?

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Q. Let A’s public key is n=6, 736, 180, 7817, 961, 456, 267 and e = 5 and B sends the ciphertext. c = 456, 871, 122, 391, 882, 538 to A. Determine B’s message in numeric format?

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Q. In encryption, which of the following is the best text encoding technique?

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Q. _______ are used as the base of the Public Key Infrastructure.

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Q. The default key size of RC2 Feistel cipher is _______

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Q. How many combinations of keys can be constructed from a 72 ciphertext stream cipher?

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Q. What is the block size of RC6 Feistel block cipher?

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Q. Suppose that there are two primes, p₁ = 229 and p₂ = 61. Find the value of z and Φ.

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Q. ________ can decrypt traffic to make it available to all other network security functions such as web proxies.

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Q. The ROT13 caesar cipher system has an offset of ___________

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Q. In a public key system, the cipher text received is C = 10 if RSA encryption used with a public key(e = 11, n = 77) to deduce the plain text. Determine the value of ϕ(n)?

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Q. To encrypt a message _______ is used on the character’s positions.

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Q. The public key of given user, in an RSA encryption system is e = 57 and n = 3901. What is the value of Euler’s totient function ϕ(n) for calculating the private key of the user?

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Q. Using RSA algorithm what is the value of cipher test c if the plain text e = 7 and P = 5, q = 16 & n = 832. Determine the Euler’s totient function for the plain text?

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Q. There are 67 people in a company where they are using secret key encryption and decryption system for privacy purpose. Determine the number of secret keys required for this purpose?

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Q. In a transposition cipher, the plaintext is constructed by the ________ of the ciphertext.

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