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Thursday 22 October 2026

Ciphers

Ciphers · Page 2

Stories 21–40 of 53, newest first. Back to the latest

  1. Ciphers

    Autokey from the rail

    Hard. Autokey Vigenère. Primer RAIL, then the plaintext itself becomes the rest of the key. Spaces stripped.
  2. Ciphers

    Beaufort on the Gulf

    Medium. Beaufort cipher, keyword STAR. Same operation encodes and decodes.
  3. Ciphers

    Bifid in the factory

    Hard. Bifid cipher. Keyword TESLA, period 5, I/J share.
  4. Ciphers

    Digits on the invite

    Medium. Gronsfeld. Like Vigenère, but the key is digits. Key 2014. Spaces honest.
  5. Ciphers

    Flags on the pad

    Easy. Semaphore. Flags as clock positions, letters A–Z around the circle.
  6. Ciphers

    Bacon on the desk

    Medium. Baconian cipher. Five a/b symbols a letter. A=aaaaa.
  8. Ciphers

    Five and eight

    Medium–hard. Affine cipher. E(x) = (5x + 8) mod 26. A=0.
  9. Ciphers

    Five by five, good news

    Easy–medium. Polybius square. I and J share a cell.
  10. Ciphers

    Pigpen at the chopsticks

    Easy. The old Masonic alphabet. One word.
  11. Ciphers

    Playfair, Tesla

    Hard. Playfair square. Keyword TESLA. I/J share. X fills doubles.
  12. Ciphers

    Read the columns, rail

    Medium. Columnar transposition. Keyword RAIL.
  13. Ciphers

    Star key on the Gulf

    Medium. Vigenère. Keyword STAR, repeating.
  14. Ciphers

    Taps from the tower

    Easy–medium. Prison tap code. Five-by-five, I and J share.
  15. Ciphers

    Three rungs to steel

    Easy. A word ladder. Change one letter at a time.
  16. Ciphers

    Three ships, three places

    Harder. A tiny logic grid. This week's Starship traffic.
  17. Ciphers

    Ship 40 heads home

    SpaceX photos, 27 August: Flight 13’s ship inspected off Christmas Island, loaded for the long tow back to Starbase. Morse, then ROT13.
  18. Ciphers

    Surprise and shine

    Apple’s 9 September invite, sent this week from Cupertino: Surprise and shine, 10 a.m. Pacific. Hex, ASCII, spaces are 20.
  19. Ciphers

    Thirty-three on the pad

    Friday 28 August: SpaceX ran a full-duration 33-engine static fire of Super Heavy Booster 21 for Flight 14. Caesar plus seven.
  20. Ciphers

    The grille turns

    Medium. Turning grille. 4×4, four holes, clockwise.
  21. Ciphers

    Four squares, rail and ship

    Medium–hard. Four-square. Keywords RAIL and SHIP. I/J share.

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