Q. _____________________ is the art & science of cracking the cipher-text without knowing the key.

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Q. The process of disguising plaintext in such a way that its substance gets hidden (into what is known as cipher-text) is called _________________

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Q. The method of reverting the encrypted text which is known as cipher text to its original form i.e. plain text is known as ________________

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Q. Which of the following is not the primary objective of cryptography?

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Q. Cryptography offers a set of required security services. Which of the following is not among that 4 required security services?

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Q. A cryptosystem is also termed as ______________

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Q. ______________ is the mathematical procedure or algorithm which produces a cipher-text for any specified plaintext.

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Q. _______________ takes the plain text and the key as input for creating cipher-text.

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Q. ____________________ is a mathematical algorithm that produces a unique plain text for a given cipher text along with a decryption key.

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Q. A set of all probable decryption keys are collectively termed as ____________

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Q. Encryption-decryption in cryptosystem is done in ______ ways.

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Q. In _____________________ same keys are implemented for encrypting as well as decrypting the information.

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Q. In __________________ 2 different keys are implemented for encrypting as well as decrypting that particular information.

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Q. A set of all probable decryption keys are collectively termed as key space.

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Q. ____________ is a mono-alphabetic encryption code wherein each & every letter of plain-text is replaced by another letter in creating the cipher-text.

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Q. _____________ is the concept that tells us about the replacement of every alphabet by another alphabet and the entire series gets ‘shifted’ by some fixed quantity.

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Q. ________________ is a cipher formed out of substitution where for a given key-value the cipher alphabet for every plain text remains fixed all through the encryption procedure.

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Q. In Playfair cipher, at first, a key table is produced. That key table is a 5 by 5 grid of alphabets which operates as the key to encrypt the plaintext.

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Q. ______________ employs a text string as a key that is implemented to do a series of shifts on the plain-text.

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Q. The ________________ has piece of the keyword that has the same length as that of the plaintext.

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