IPA: /ˈsaɪfərər/
KK: /ˈsaɪfərər/
A person who uses codes or ciphers to write or decode messages.
The cipherer worked late into the night to decode the secret message.
Cipherer → It is formed from "cipher" (from Old French *cifre*, meaning a code or a method of writing in code) and "-er" (meaning a person who). A cipherer is a person who creates or uses codes.
Think of a person who works with codes ('cipher') — the '-er' just means a person. A cipherer is someone who deals with codes.