kryptogram

Later in 1934, Foss was able to break an early Japanese cipher machine.

The Japanese used a cipher machine to encode their diplomatic messages.

Yes, they have even given us a cipher machine with our own frequencies and routines.

The embassy was then to destroy their cipher machines.

They carefully opened the box and found that it did not, in fact, contain radio equipment but a cipher machine.

The cipher machine (and its many revisions) was used until the mid-1950s when other more modern military encryption systems came into use.

In 1926, an inter-departmental committee was formed to consider whether they could be replaced with cipher machines.

The British changed their cipher machines about four months ago.

Others, I am not sure, but you use same cipher machines for all, yes?

If she could come over to us, she would bring her cipher machine with her.