A person who solves secret codes or ciphers without being given the key.
Reach for it when naming cryptanalytic skill in historical, security, or puzzle contexts
The codebreaker recognized that repeated symbols marked common short words.
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playful
code cracker
Fits when an informal, energetic label suits a puzzle context
Careful Avoid this breezy label in a professional title; it may suggest unauthorized hacking.
everyday
decoder
Fits when someone or something converts an encoded message
Careful A decoder may possess the key and perform a routine conversion rather than break a code.
warm
cipher expert
Fits when plain language should emphasize expertise
Careful Expertise in ciphers can include designing them, not defeating them.
professional
cryptanalyst
Fits when formal analysis of cryptographic systems is the occupation or discipline
Careful Cryptanalyst is technical and can include vulnerability research beyond solving one code.
formal
decipherer
Fits when the work is making difficult writing or symbols intelligible
Careful Decipherer can handle handwriting or ancient scripts with no secrecy involved.
skilled codebreaker
The skilled codebreaker tested letter frequencies before guessing any names.
wartime codebreaker
The wartime codebreaker worked within a large multilingual team.
codebreaker solved
The codebreaker solved the training cipher without seeing the key.
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