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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Q. How many bits of message does the Secure Hash Algorithm produce?

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Q. _______ is an example of asymmetric ciphers.

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Q. There is no secret key in case of ____________

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Q. Suppose in order to get a message across enemy lines, we need to choose an initial secret key say, 100110. What will be the decrypted cipher when the original message is 010010011.

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Q. Electronic Code Book process is used in ________

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Q. ______ uses the concept of pseudo-random sequence.

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Q. How many bits are there for random bits and error detection bits in the case of DES block ciphers?

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Q. What are the steps in the Feistel function?

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Q. What type of algorithm does AES encryption use?

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Q. What is the block size of blowfish block cipher?

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Q. In which cipher each letter of the plaintext is substituted by any other letter to form the cipher message?

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