state secret
official secret

There were some state secrets involved, but I'm not very sure.

Because it is said that they once knew state secrets.

It's not as though you were giving away state secrets, or anything.

So long ago and he still treated them as state secrets.

He then added, "As of now, everything about this project is a state secret."

There is no reason they should be treated like state secrets.

Another problem is that Russia still has no law on state secrets.

An Israeli official here said their number is "a state secret."

The exact number is probably much higher and therefore a state secret.

I knew better than to be curious about state secrets.

She was later asked not to discuss this "state secret".

The final design has been guarded like a state secret.

As for the government's state secrets argument, that's another story.

His health has been a closely guarded state secret for years.

Forest resources for many years were treated as a state secret, they said.

And at the foot of the ladder we found a state secret.

To have discovered my identity, for instance, which is a State secret.

"There are no state secrets anyone is giving away," he said.

That can't be a state secret, yet no one will tell me.

Government officials still treat its contents as a state secret.

"But do you think he had any state secrets to reveal?"

It's quite a state secret, but some Chinese believe that's essentially what has happened.

Or had knowledge of the contacts been made a state secret, meant only for those with a need to know?

The list stayed a state secret until 1989 when it was published for the first time.

The anticipated power of the weapon system is a state secret.

I have never known whether this project was an official secret.

However this was to be considered as an official secret.

The scientists have used a model to test the technology, which was an official secret until recently.

He saw it as his duty to keep official secrets.

Quite apart from official secrets, there were things Jack did not want any other man to hear.

From their view I'm a walking encyclopedia of official secrets.

Official secrets acts were taken, of course, very seriously by all involved it seems.

His works remained an official secret for many years.

From the beginning the identify of the station's owner and operator was an official secret.

Even though I got the reasons for it made an official secret, he knew, he knows.

"How is the case going, or is that an official secret?"

But we cannot then expect those same people to know some of the most important official secrets of the land they lead.

This they did, with the assistance of the official secret services and the political and military forces.

It is to the effect that you disclosed official secrets to your late uncle and to other persons.

What possible reason could he have for doing so other than to obtain illicit possession of official secrets.

"I'd like to examine the official secrets vault," he said.

The phrase official secrets act may also be used to refer to statutes of a similar nature in other countries.

The girls were required to take the Official Secrets oath.

I'll sign the official secrets act and never reveal anything a see or hear in your car .

Furze, who always knew any official secret, told him.

The second military intelligence report contradicted this, stating that there was no "official secret".

It had few civil servants and therefore few official secrets.

The process itself was labeled an official secret.

He mumbled about official secrets and civil service discipline.

Well, all this comes under the Official Secrets Act, of course.