Is the Secrecy Bureau a public institution or a civil servant?

Civil servants. Official website introduced that the Secrecy Bureau is a civil servant, not a public institution. The Secrecy Bureau has strict recruitment procedures and is staffed by civil servants. The unit level of the Secrecy Bureau is the deputy ministerial level. The State Secrecy Bureau is a functional department of the government and exists in all levels of government. At the county level, it is generally renamed as the "Confidential Security Bureau", but it assumes the responsibility of the State Security Bureau.