PPT On Hill Cipher

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    Muhammad R

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In classical cryptography, the Hill cipher is a polygraphic substitution cipher based on linear algebra. Invented by Lester S. Hill in 1929, it was the first polygraphic cipher in which it was practical (though barely) to operate on more than three symbols at once.This PPT will give a brief idea about Hill Cipher.

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    Jeqd!O رر
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    Hill Cipher Takes two or three or more letter combinations to the same size combinations, e.g. "the" -Y "rqv" Uses simple linear equations An example of a "block" cipher encrypting a block of text at a time Numbered alphabet: a = 0, b = 1, c = 3, etc. (in CAP, use ASCII code)
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    Hill Cipher Encryption: mod 26 where K is a key matrix that should not be a singular matrix.
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    Hill Cipher Decryption: Kl mod 26 where 1
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    Example cl c2 — 16*p1 + c3 - 5*p1 + cl c2 c3 18*p2 + IO*p3 21*p2 + 1*p3 12*p2 + 23*p3 (mod 26) (mod 26) (mod 26) 9 16 5 18 21 12 10 1 23 pi (mod 26)
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    I 8 can't do it 13 19 3 14 8 19 10 1 23 10 1 23 10 1 23 EOM 8 2 13 19 3 14 8 19 TMY SVJ 4 14 12 19 12 14 18 21 9 9 16 5 9 16 5 9 16 5 18 21 12 18 21 12 18 21 12 (mod 26) (mod 26) (mod 26)
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    kli k21 k31 Hill — 1

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