Four couriers worked the same city on the same morning, and nobody saw any of them meet. You've got the case officer's notes, and that's all you need.
Latest in Ciphers
A mini crossword on the language of spying
A medium mini crossword on the language of spying. Nine clues, and every answer is a word a case officer would use without blinking.Ten words from Cold War Berlin, hidden in a grid
A find-a-word with ten Cold War Berlin words, from Checkpoint to Stasi. The leftover letters spell what happened on one bridge in 1962.Crack the Vigenère note a courier left on the ferry
A medium Vigenère cipher. One courier note, one eight-letter keyword you have to work out from a clue, and a plain instruction underneath.Seven quick questions on spies, satellites and Australia
A medium quick-fire quiz with seven questions on Australian intelligence, spy satellites and computing, from Pine Gap to CSIRAC.Entry exam on the night desk
Five locks at the raised bar: tradecraft logic, a crossword, a find-a-word, Playfair, and a Cardano grille. Answers folded. They stay on the paper.Tumblers on gold
Four short locks for Wednesday on The Gold Standard. ROT13, a two-word cross, Morse, and a hex dump.Four new locks
A rail fence, a tiny cross, Morse, and A-is-1. A fresh set.Four more for the night desk
Caesar, a tiny cross, a letter matrix, and more hex. Still short.Four for the first night
A cryptogram, a mini crossword, a letter matrix, and a hex dump. None of them long.Fraction on the pad
Medium–hard. ADFGX. Five-by-five fractionated Morse-style grid, then the pairs as letters A D F G X.Nihilist on the rail
Hard. Nihilist: Polybius numbers plus a repeating key. Key RAIL. I/J share.Porta, star key
Medium. Porta cipher. Keyword STAR. Reciprocal alphabets, so encode equals decode.Running key, Standard
Hard. Running-key Vigenère. The key is THESTANDARD, letters only, no spaces in the key stream.Trifid, good news
Hard. Trifid. 27-character alphabet A–Z plus a full stop, period 5.Autokey from the rail
Hard. Autokey Vigenère. Primer RAIL, then the plaintext itself becomes the rest of the key. Spaces stripped.Beaufort on the Gulf
Medium. Beaufort cipher, keyword STAR. Same operation encodes and decodes.Bifid in the factory
Hard. Bifid cipher. Keyword TESLA, period 5, I/J share.Digits on the invite
Medium. Gronsfeld. Like Vigenère, but the key is digits. Key 2014. Spaces honest.Flags on the pad
Easy. Semaphore. Flags as clock positions, letters A–Z around the circle.
