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Block Ciphers.

A block cipher is an encryption function for fix-sized blocks.

Given n-bit sized block 'p', encryption function Ek(p) will encrypt that block using key 'k'.

It can be compared to a lookup table where for each pair (k,p) encrypted block 'c' of size equal to size of block 'p' can be produced.

A n-bit block cipher can be compared to lookup table of size 2n, with each element consisting of n bits.

Such cipher's encryption can be reversed.

For more details, see Literature: [8], [3].

See also: Block Cipher Modes.

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