Classical Cryptography 3

Which of the following equation is correct to find the inverse of the key matrix for Hill Cipher Decryption

where K is the key matrix,

d is the determinant of the key matrix

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For One time Pad Which of these are Not a Mandatory rule

• The OTP should consist of Truely random characters (noise).

• The OTP (i.e. the key) should have the same length as the plaintext (or longer).

• Only two copies of the OTP should exist.

• The OTP should be used only Twice.

If a number is divided by several other numbers that have no common factors, one can find the remainder when dividing by the product of those numbers.

• Chinese Remainder Theorem

• Rule for One time Pad

• Fast modular exponentiation theorem

• LFSR theorem

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Which of these is NOT the Sub Components of an LFSR

• Shift Register

• Linear Feedback

• Taps

• Clock

• Pseudo Random Generator

Which mode does this Block cipher represent

• Cipher Block Chaining

• Electronic Code Book

• Cipher Feedback Mode

• Output Feedback Mode

......................................................... is a non-secret, unique value used to ensure that encrypting the same plaintext with the same key results in different ciphertexts

• Initialization Vector

• Seed Vector

• Modulation Vector

• Decryption Vector

...............................generates an arbitrary fixed length value based on initial data

• Pseudo Random Function

• Hashing

• Digital Signature

• Key Distribution