慣用 かんよう暗号 あんごう方式 ほうしきじゃなかったです
kan'yōangōhōshikijanakattadesu

Noun
Desu Copula

The polite, past negative form of 慣用暗号方式

1. Wasn't a customary code.; Wasn't a common cipher.

Past/Perfective
Negative
Polite
Casual Register
Computing