Cabinet Noir>Practice / Affine cipher

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A substitution driven by the line y = a·x + b: multiply the letter, then shift, all mod 26.
Typesubstitution cipher
Breaking iteasy to break by hand
EraAntiquity — today
NameA mathematical generalisation of the Caesar shift, named after the affine function ax + b.
Modesencrypt · decrypt · cryptoanalysis

Practice

Affine cipher
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Fortune favors the brave

Easy
WXGMPUTWHSXGJMCTKGHST
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Elementary

Medium
NKNRNYOLAXRXGNLAJLOHFY
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Fourscore and seven

Hard
IDRKVBDKXFSMVXCXSJXFKVFTDDRKIFGEXKVQKDRTEGIDKGEDSGEPVBDSGPSXSGFSXN
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Created by Denys Grybov in 2021

v.0.4.0 // released on 18.10.2026