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What will be the ciphered text corresponding to plain text “sanfoundry” if an affine cipher is used with key values as a=5, b=10?

(a) wkxjcgxzra

(b) gkxteuxfzw

(c) ukxhmyxdfg

(d) rfsexbsumv

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Right option is (a) wkxjcgxzra

Easiest explanation - Affine cipher uses linear algebra for the purpose of encryption. It uses the formula  (ax+b)%26 for this purpose. So the ciphered text will be “wkxjcgxzra”.

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