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BID 610

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BID 610 (Alvis)
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Three BID 610 racks with shields removed. The shields would only be removed to reconfigure the plugboards. It would otherwise be a Tempest violation to operate Alvis without the shields in place. (Photo courtesy of the COMWEB Museum.

The BID 610, a crypto machine of British design introduced in the 1960's, was the first fully transistorized full duplex on-line cipher machine used by the British Army. It operated in two modes: Mode A which was start/stop (Asynchronous) and Mode B which was fully synchronous operation over a land line or radio circuit. In Mode B, a BID 700 synchronizing unit had to be used. BID 610 could handle information up to TOP SECRET level. It was used from the 1960's to the 1980's.

This machine was also used by Canada's Foreign Service communicators. They were employed at Canada's larger diplomatic missions and were used to communicate to various government departments. Pictured above are three separate BID 610's in a rackmount configuration. Each of the "circuits" is identified with dymo tape at the top of the cabinet.