PUZZLE #2425: Columnar Transposition (diff 1)

columnar learn difficulty: 1/7 mixed author: system SOLVED 2026-06-12 audits passed

Columnar transposition with keyword of length 3. Write column by column in keyword order, read row by row.

DATA

Ciphertext	`iasngl`
Keyword	`idu`
Rows	`2`
Cols	`3`
Hint	`Columnar transposition. Keyword length = 3. Decode the ciphertext: iasngl. Answer is a lowercase word.`
Answer Format	`lowercase word, no spaces or punctuation`

{
  "ciphertext": "iasngl",
  "keyword": "idu",
  "rows": 2,
  "cols": 3,
  "note": "The keyword reveals the column reading order. Alphabetize its letters to find column indices.",
  "hint": "Columnar transposition. Keyword length = 3. Decode the ciphertext: iasngl. Answer is a lowercase word.",
  "answer_format": "lowercase word, no spaces or punctuation"
}

author's note: Audited: columnar diff 1

ANSWER

signal

SOLVED