There is also an enciphered message in one image that reads "He used it to develop a bottomless source of energy, Telefunken wireless station."

Usually, the transmitting operator informed the receiving operator of this message key by transmitting some plaintext or ciphertext before the enciphered message.

Alice, believing this public key to be Bob's, encrypts her message with Mallory's key and sends the enciphered message back to Bob.

At the end, you'll get the chance to take a crack at an enciphered message.

However, the insecure procedure of sending the enciphered message key twice, remained in use, and it was quickly exploited.

The machine had one tape for the enciphered message.

He drafted them both to the Admiralty section to deal with enciphered wireless messages to and from German submarines.

Awaiting him in the embassy had been an enciphered message from Mos- cow Center-that hadn't changed-with names and detailed descriptions.

The term crib was used at Bletchley Park to denote any known plaintext or suspected plaintext at some point in an enciphered message.

The automation of these processes required the processing of large quantities of punched paper tape such as those on which the enciphered messages were received.