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Battlefield Encryption

机译：战地加密

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摘要

Communications Security (COMSEC) is at the heart of all tactical communications. Which strategies and technologies are available to ensure, protect and transmit military voice and data traffic, lest prying opponents eavesdrop on what is being said and shared between military units, partners or allies? Churchill once said that; "In wartime truth is so precious that she should always be attended to by a bodyguard of lies." In the realm of digital communications, the truth is protected by two dominant forms of COMSEC; frequency-hopping and encryption. Formally known as Frequency-Hopping Spread Spectrum (FHSS), this process is fairly self-explanatory in that it utilises a range of frequencies across which a transmission jumps. This process is achieved by taking a radio's carrier wave and moving it across a range of different frequency channels via the process of rapid switching. The rapid switching occurs in a so-called 'pseudorandom' sequence, i.e. the process appears to be random, but in reality is known to the transmitter and receiver. The use of a wide range of different frequencies with a transmission changing rapidly between them makes it extremely difficult for jamming to disrupt the communications.
机译：通信安全（COMSEC）是所有战术通信的核心。可以使用哪些策略和技术来确保，保护和传输军事语音和数据流量，以免撬动对手窃听军事单位，合作伙伴或盟友之间的言论和共享？丘吉尔曾经说过； “在战时，真相如此珍贵，以至于她总是要被一个谎言保镖照顾。”在数字通信领域，真理受到两种主要的COMSEC形式的保护：跳频和加密。正式称为跳频扩频（FHSS），此过程相当不言自明，因为它利用了传输跳变的频率范围。该过程是通过获取无线电载波并通过快速切换的过程使其在一系列不同的频率信道上移动来实现的。快速切换以所谓的“伪随机”序列发生，即该过程似乎是随机的，但实际上对于发送器和接收器是已知的。使用范围广泛的不同频率，并且它们之间的传输会快速变化，因此，干扰极难破坏通信。

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