STU-I
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The STU-I was a secure telephone developed by the U.S. National Security Agency for use by senior U.S. government officials in the 1970s.
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Cipher machines
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| 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 |
| History of cryptography | Cryptanalysis | Cryptography portal | Topics in cryptography |
| Symmetric-key algorithm | Block cipher | Stream cipher | Public-key cryptography | Cryptographic hash function | Message authentication code | Random numbers |
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