秘密 ひみつ かぎ暗号 あんごう方式 ほうしきでしょう
himitsukagiangōhōshikideshō

Noun
Desu Copula

Expresses probability in a polite manner ("probably…") of 秘密鍵暗号方式

1. Probably a secret key cipher.; Likely a secret key encryption method.

Polite
Presumptive
Conjecture
Computing