At other times, presidents used feints to cover up national security secrets.

The law demands the declassification of Government papers after 30 years, unless they compromise national security secrets.

The Justice Department had wanted the hearing to be closed to the public, saying it would involve discussion of national security secrets.

The press was barred in order to avoid revealing "national security" secrets.

No security secrets need be revealed to justify convictions.

Then he got to work prosecuting them for selling or giving American security secrets to communist governments.

The government argued that if the case went forward, it would put national security secrets at risk.

Naomi Grimley asks if the modern media can keep national security secrets.

Together with the Administration, it should also move quickly to assure better protection of America's national security secrets.

Well, I'll let you in on a little national security secret: I'm not permitted to.