A person who specializes in decoding encrypted messages or breaking ciphers; a cryptographer or someone skilled in cryptanalysis.
From 'codebreak' (breaking a code) plus '-er' (one who does the action), forming an agent noun for a specialist in cryptography.
Codebreakers often started as chess champions, crossword puzzle wizards, or linguists—their shared talent was pattern-recognition at the edge of human capability, making them closer to artists than traditional scientists.
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