examples/sample_ciphertexts.md

Sample Ciphertexts

Use these in Detect Mode or Compare Mode. Expected answers are at the bottom — try to call them yourself first using Explain Mode.

1 — Caesar / ROT

WKLV LV D FODVVLFDO FDHVDU FLSKHU GHPR IRU FLSKHU GHWHFWLYH DL

2 — Atbash

GSV XLWV RH ZOO BLFIH GSV VEVIVHG RMP

3 — Vigenère (short, deliberately hard)

LXFOPVEFRNHR

4 — Rail Fence

TEITELHDVLSNHDTISEIIEA

5 — Columnar transposition

EOACT IPTRH IIEEN HSGES SOSCR REMEN AERTC OEFNT TYIHE THCMC

6 — Plaintext

THE LIBRARY PRESERVES KNOWLEDGE FOR THE COMMUNITY

7 — Affine

IZZWVU NWHJUS NSV BUKUSO YUSL NWHJUSE

8 — Monoalphabetic substitution

GUF KSCQNQA HQFDFQXFD ZRMVKFTBF YMQ GUF EMSSWRSGA

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Expected answers

#	Cipher	Notes
1	Caesar shift 3	Brute-forces in 26 tries. Chi-squared confirms.
2	Atbash	Self-inverse — a single decode test wins.
3	Vigenère, key LEMON	Sample is too short for high confidence — that's the lesson.
4	Rail-fence (3 rails)	English letters, weak bigrams: classic transposition signature.
5	Columnar transposition	Same family as #4; bigram support stays low.
6	Plaintext	Should classify confidently as plaintext.
7	Affine, a=5, b=8	312-key brute force; the affine candidate table surfaces it.
8	Monoalphabetic substitution	English-like IoC but disrupted bigrams.