国こっ家か機き密みつ

noun, noun which may take the genitive case particle 'no'

state secrets; national secrets

Refers to confidential information whose disclosure would harm national security or interests. Often used in legal, political, and espionage contexts.

• その文ぶん書しょは国こっ家か機き密みつに指し定ていされている。

  The document is classified as a state secret.