IPA: /ˈkrɪp.təˌɡræf.ər/
KK: /ˈkrɪp.təˌɡræf.ɚ/
A person who creates or studies codes and ciphers to keep information secret.
The cryptographer worked late into the night to decode the secret message.
Cryptographer → It is formed from "crypto-" (from Greek "kryptos", meaning hidden) and "grapho" (from Greek "grapho", meaning to write). A cryptographer is someone who writes in a hidden or secret manner, typically for the purpose of encoding information.
Think of 'hidden' ('crypto-') and 'writing' ('grapho') to remember that a cryptographer is someone who writes in a secret or hidden way.