This application report describes and characterizes secure communication systems over the Public Switched Telephone Network (PSTN). Global solutions are presented concerning the secure transmission of speech, data and facsimile group 3 signals. The areas covered by this work are source coding/decoding and ciphering/deciphering. The Texas Instruments (TI) TMS320C50 digital signal processor (DSP) facilitated the development of a low cost solution to a realtime problem. The TI DSP made it possible to implement simple and generic architectures while supporting complex computational models. This document was part of the first European DSP Education and Research Conference that took place September 26 and 27, 1996 in Paris. For information on how TI encourages students from around the world to find innovative ways to use DSPs, see TI’s World Wide Web site at www.ti.com.
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