Traffic-flow Security

• changing radio callsigns frequently
• encryption of a message's sending and receiving addresses (codress messages)
• causing the circuit to appear busy at all times or much of the time by sending dummy traffic
• sending a continuous encrypted signal, whether or not traffic is being transmitted.

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systems design tactical communications tactical communications system tactical data information link a tape relay t carrier technical control facility telecommunications service teleconference teletraining terminal adapter	terminal equipment ternary signal thermodynamic temperature third order intercept point threshold time assignment speech interpolation time code ambiguity minimum spanning tree time division multiplexing time domain reflectometer time out	time scale t interface toll switching trunk total harmonic distortion traffic intensity transceiver transcoding transmission transmission block transmission coefficient transmission level point	transmission line transmission medium transmit after receive time delay transmit flow control transmitter attack time delay transparency transponder transposition transverse redundancy check tree structure troposphere