Centuries: 3rd century - 4th century - 5th century
Decades: 260s 270s 280s 290s 300s - 310s - 320s 330s 340s 350s 360s
Years: 312 313 314 315 316 - 317 - 318 319 320 321 322
... Communications security includes cryptosecurity, transmission security, emission security[?], and physical security of COMSEC material[?].
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