A message-to-be-transferred is enciphered to ciphertext at the encoding terminal by encoding the message as a number M in a predetermined set. Source: Internet
Colossus was designed to perform the task of "Wheel Setting", that is determining the start point of the stream of key characters in relation to the characters of the enciphered message on the paper tape loop. Source: Internet
Each transmission, which often contained more than one message, was enciphered with a different start position of the wheels. Source: Internet
It enciphered vowels (AEIOUY) and consonants separately, perhaps to reduce telegram costs, and this was a significant weak point. Source: Internet
It must map all other characters to themselves; it reads characters one at a time and outputs their enciphered equivalents until it reads an EOF (here assumed to be represented as either -1 or "no change"), at which point the program terminates. Source: Internet
Messages were sent to and fro across the Atlantic by enciphered teleprinter links. Source: Internet