Cabinet Noir
>Decrypt / Affine cipher
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A substitution driven by the line y = a·x + b: multiply the letter, then shift, all mod 26.
Type
substitution cipher
Breaking it
easy to break by hand
Era
Antiquity — today
Name
A mathematical generalisation of the Caesar shift, named after the affine function ax + b.
Modes
encrypt · decrypt · cryptoanalysis
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Tool
Cryptoanalysis
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History
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Created by Denys Grybov in 2021
v.0.4.0 // released on 18.10.2026