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Results tagged with affine-cipher
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user 2028
A type of monoalphabetic substitution cipher, wherein each letter in an alphabet is mapped to its numeric equivalent, encrypted using a simple function `(ax + b) mod m`.
6
votes
How does this affine cipher work?
W is 87 in ASCII, so
$$
87a+b\equiv064066\pmod{256256}.
$$
I is 73 in ASCII, so
$$
73a+b\equiv158368\pmod{256256}.
$$
Subtracting, you get
$$
14a\equiv-94302\equiv161954\pmod{256256}.
$$
Unfortunat …
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