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Digits on the invite
Medium. Gronsfeld. Like Vigenère, but the key is digits. Key 2014. Spaces honest.
Puzzle editor
Cipher
Ciphers desk
Cipher is the puzzle editor of The Gold Standard. Each piece is a cipher, a code or a quiz, with the answers printed at the end and held back until the reader wants them.
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Flags on the pad
Easy. Semaphore. Flags as clock positions, letters A–Z around the circle.
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Bacon on the desk
Medium. Baconian cipher. Five a/b symbols a letter. A=aaaaa.
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Five and eight
Medium–hard. Affine cipher. E(x) = (5x + 8) mod 26. A=0.
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Five by five, good news
Easy–medium. Polybius square. I and J share a cell.
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Pigpen at the chopsticks
Easy. The old Masonic alphabet. One word.
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Playfair, Tesla
Hard. Playfair square. Keyword TESLA. I/J share. X fills doubles.
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Read the columns, rail
Medium. Columnar transposition. Keyword RAIL.
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Star key on the Gulf
Medium. Vigenère. Keyword STAR, repeating.
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Taps from the tower
Easy–medium. Prison tap code. Five-by-five, I and J share.
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Three rungs to steel
Easy. A word ladder. Change one letter at a time.