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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Q. In _____________ a sequence of actions is carried out on this block after a block of plain-text bits is chosen for generating a block of cipher-text bits.

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Q. In _______________ the plain-text is processed 1-bit at a time & a series of actions is carried out on it for generating one bit of cipher-text.

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Q. The procedure to add bits to the last block is termed as _________________

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Q. Which of the following is not an example of a block cipher?

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Q. Data Encryption Standard is implemented using the Feistel Cipher which employs 16 round of Feistel structure.

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Q. DES stands for ________________

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Q. ____________ carries out all its calculations on bytes rather than using bits and is at least 6-times faster than 3-DES.

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Q. AES stands for ________________

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Q. AES is at least 6-times faster than 3-DES.

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Q. _____________ is another data hiding technique which can be used in conjunction with cryptography for the extra-secure method of protecting data.

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Q. _____________ is hiding of data within data, where we can hide images, text, and other messages within images, videos, music or recording files.

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Q. Steganography follows the concept of security through obscurity.

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Q. The word ________________is a combination of the Greek words ‘steganos’ which means “covered or concealed”, and ‘graphein’ which means “writing”.

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