BID 770
Missing image
TOPIC.jpg
TOPIC.jpg
The basic TOPIC equipment without the power supply on display at Bletchley Park.
The BID 770 was a British-built electronic cryptography device, codenamed TOPIC. It was also used by Canada's foreign service under the codename TENEC. TOPIC was brought into service in 1977, and became obsolete in 1995.
TOPIC was used to protect telegraph traffic, and replaced the earlier mechanical system called ROCKEX. It could be operated in both on- and off-line modes. Weighing 65lb, the machine used Double-Transistor logic instead of single transistors.
External links
| Cipher machines edit |
| Rotor machines: Enigma | Fialka | Hebern | HX-63 | KL-7 | M-325 | NEMA | SIGABA | Typex |
| Mechanical: Bazeries cylinder | C-52 | CD-57 | HC-9 | Kryha | Jefferson disk | M-94 | M-209 | Scytale |
| Teleprinter: 5-UCO | BID 770 | KW-26 | KW-37 | Lorenz SZ 40/42 | Siemens and Halske T52 |
| Secure voice: KY-57 | Secure Terminal Equipment | SIGSALY | STU-III | VINSON | FNBDT |
| Miscellaneous: Cryptex | JADE | KG-84 | PURPLE | Pinwheel |