STU-II
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The STU-II is a secure telephone developed by the U.S. National Security Agency.
According to information on display in 2005 at the NSA's National Cryptologic Museum, the STU-II was in use from the 1980s to the present. It uses the linear predictive coding algorithm LPC-10 at 2.4 kilobits/second, and the "Key Development Center" for key management. The display also stated that the STU-II B is the standard narrow band secure telephone.
STU-II replaced the STU-I, KY-3 and the Navajo-1. The last was a secure telephone in a briefcase, of which 110 were built in the 1980s for use by senior government officials when traveling. It also used LPC-10.
Some 10 000 STU-II units were produced.
Source
Display labels from [link]
See also
| Cipher machines [edit] |
| Rotor machines: CCM | Enigma | Fialka | Hebern | HX-63 | KL-7 | Lacida | M-325 | Mercury | NEMA | OMI | Portex | SIGABA | SIGCUM | Singlet | Typex |
| Mechanical: Bazeries cylinder | C-36 | C-52 | CD-57 | Cipher disk | HC-9 | Kryha | Jefferson disk | M-94 | M-209 | Reihenschieber | Scytale |
| Teleprinter: 5-UCO | BID 770 | KW-26 | KW-37 | Lorenz SZ 40/42 | Siemens and Halske T52 |
| Secure voice: KY-3 | KY-57 | KY-58 | KY-68 | OMNI | SIGSALY | STE | STU-II | STU-III | VINSON | SCIP | Sectéra Secure Module |
| Miscellaneous: Cryptex | JADE | KG-84 | KL-43 | Noreen | PURPLE | Pinwheel | Rockex |
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