German military intelligence
Arlington Hall Station
"blue jacket" or "Black Jumbo," terms for diplomatic translations done by the GC&CS
Bletchley Park Intelligence Exchange
Britain/United States of America
A method of concealing plaintext by transposing letters or numbers or by substituting other letters or numbers according to a key
A method of concealing a message text in which arbitrary groups of letters, numbers, or other symbols replace words, phrases, letters, or numbers for the purposes of concealment or brevity.
Chief, Secret Service (Director, MI-6)
direction finding ...