classified information; top secret
Refers to information that is officially restricted or highly confidential, often used in governmental, military, or corporate contexts.
The document is treated as classified information.
He was arrested on suspicion of leaking top secret information.
機密情報 is a more general term for confidential information, while 極秘情報 emphasizes the highest level of secrecy.
Compound of 極秘 (top secret) and 情報 (information).