My first Gronsfeld
Introduction
This is a Gronsfeld cipher: a repeating sequence of digits applies Caesar shifts, one digit per position. Use Repeated sequences and their spacings to propose the digit-string length, then open Periodic columns with that period. In each column, compare a likely plaintext letter with its ciphertext letter and calculate the backward Caesar shift. A valid Gronsfeld Key digit is only 0 through 9, so reject guesses that require a larger shift. Assemble the surviving digits in column order, enter them in Gronsfeld transform, choose Decrypt, and Run. Revise individual digits when errors recur at one periodic position, or reconsider the period when the whole Result remains incoherent. Submit the complete readable text.
Find recurring Latin-letter groups and their gaps.
RQHpositions 42, 204, 408, 786gaps 162, 204, 378ULFpositions 146, 218, 230, 584gaps 72, 12, 354XIJpositions 33, 399, 627, 657gaps 366, 228, 30DOHpositions 325, 481, 715gaps 156, 234FCHpositions 155, 215, 461gaps 60, 246IYYpositions 9, 249, 315gaps 240, 66JAHpositions 35, 401, 797gaps 366, 396NCVpositions 59, 143, 599gaps 84, 456SJJpositions 472, 778, 790gaps 306, 12WFVpositions 613, 619, 673gaps 6, 54WIIpositions 337, 433, 511gaps 96, 78BHRpositions 192, 202gaps 10Ipv ztdu oiyy Puprtknoe,
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Latin letters · 7 phases
| Phase | n | IC |
|---|---|---|
| 1 | 115 | 0.0464 |
| 2 | 115 | 0.0403 |
| 3 | 115 | 0.0511 |
| 4 | 115 | 0.0467 |
| 5 | 115 | 0.0366 |
| 6 | 114 | 0.0376 |
| 7 | 114 | 0.0463 |
Apply Gronsfeld with a Solver-supplied digit Key.
A Gronsfeld Key must contain one or more digits only.