Secret Internet Protocol Router Network – SIPRNET). Both allies and adversaries of the United States are interested in STU-III, STE, and other secured voice technologies developed by the NSA. To date, there has not been any reported cryptanalysis on the encryption algorithms used by the STU-III and STE. Any breaks in these algorithms could jeopardize national security. Information about STU-III is very limited despite the fact that it is out of production. Because of the sensitive nature of the subject, there are few relevant documents available. The majority of the information available originates from the manufacturers (e.g. L-3 Communications) of STU-III and STE. See also SIGSALY STU-I STU-II KG-84 SCIP Secure Terminal Equipment References External links STU-III Handbook STU-III Description, Technical Specification, Pictures Report on VOIP and Secure Communications The NAVY INFOSEC WebSite on STU-III and STE National Security Agency encryption devices Secure telephones