Who should decide what information is secret and not released to the public for reasons of national security?

Question

Who should decide what information is secret and not released to the public for reasons of national security?

Answer 1

Israel.

Answer 2

In the United States the President should decide unless congress intervenes.

That responsibility falls to the Executive Branch of Government.  The President is the head of the Executive Branch and delegates that authority to department heads and other officials within the Executive Branch.   The Executive Branch is subject to Congressional Oversight.