My first Vigenère
Introduction
This is a repeating-key Vigenère cipher. Begin with a Key-length guess, not a keyword guess. Open Repeated sequences, record the spacings between repeated groups, and test a common divisor of several spacings as the period. Open Periodic columns with that period: each column is a Caesar cipher made by one keyword letter. Use Frequency analysis and common-letter guesses to estimate each column's shift, convert those shifts to keyword letters, then enter the candidate keyword in Vigenère transform. Choose Decrypt and Run it on the Challenge Ciphertext. A correct period and keyword must produce coherent text throughout; revise weak column shifts first, then reconsider the period. Submit the complete result.
Find recurring Latin-letter groups and their gaps.
OIIpositions 109, 431, 501, 760gaps 322, 70, 259ROIpositions 63, 108, 430, 759gaps 45, 322, 329FMApositions 246, 365, 645gaps 119, 280FYFpositions 244, 363, 643gaps 119, 280GFYpositions 243, 362, 642gaps 119, 280IIVpositions 236, 278, 761gaps 42, 483MALpositions 247, 366, 646gaps 119, 280NOApositions 498, 581, 659gaps 83, 78XVEpositions 376, 537, 811gaps 161, 274YFMpositions 245, 364, 644gaps 119, 280AEKpositions 620, 718gaps 98ALKpositions 367, 709gaps 342Qoe rsle yekm Zztpnèex, wvnccu
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Latin letters · 7 phases
| Phase | n | IC |
|---|---|---|
| 1 | 119 | 0.0695 |
| 2 | 119 | 0.0565 |
| 3 | 119 | 0.0769 |
| 4 | 119 | 0.0602 |
| 5 | 119 | 0.0752 |
| 6 | 118 | 0.0742 |
| 7 | 118 | 0.0656 |
Apply a Solver-supplied keyword in either direction.
A Vigenère keyword must contain one or more Latin letters only.