The BATCO Code
Messages in BATCO are first encoded into numbers using one of several vocabulary cards. The BATCO cipher is then used to encrypt the numbers into letters, which can be transmitted over unsecure channels. The process is reversed at the receiving end.
Each BATCO vocabulary card groups words needed for a particular function, so card changes are infrequent. Every vocabulary word on a card is assigned a two digit code. Some vocabulary card entries call for a fixed number of digits after the two digit code. For example, the code for ETA (estimated time of arrival) is followed by a four digit time of day. Each card in a set has a three digit number and there is always a code word on the card that means switch to card number xxx.
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