IPA: /ˈkrɪptəˌsɪstəm/
KK: /ˈkrɪptoʊˌsɪstəm/
A method or system used to secure information by encoding it so that only authorized users can read it.
The company implemented a new cryptosystem to protect sensitive data from hackers.
Cryptosystem → It is formed from "crypto-" (from Greek "kryptos", meaning hidden or secret) and "system" (from Greek "systēma", meaning a whole made up of parts). The word "cryptosystem" refers to a system designed to keep information hidden or secure through various methods.
Think of 'hidden' ('crypto-') information organized in a 'system' — that's what a cryptosystem does.
No commonly confused words.