Bulk encryption

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Bulk encryption is the encipherment of all traffic on a digital transmission medium, without awareness of multiplexed channels, data link protocols, etc., in the medium. Especially on wireless media, it may be combined with techniques that secure the transmission channel more than the information on it, such as frequency agility, spread spectrum, or both.

A common application would be from one military communications center to another, combining the aggregates from different multiplexing systems.