在二战中,灵活高效的无线电成为了各国军队的主要通信手段。然而,无线电却存在着易被侦听的缺陷,所以必须要将信息加密之后方能“放行”至电磁空间,让其乘上以光速运行的电波“运输机”安全飞往目的地。由于无线电通信潜藏的重大情报价值,交战各方在侦听与解码上投入了巨大力量。二战前的发展在有线电报、电话相继发明之后,对通信线路进行侦听成为截获对方信息的重要手段。为了建立起覆盖全球殖民地的通信网络,英国自19世纪中期开始开展大规模海底电缆敷 In World War II, flexible and efficient radios became the main means of communication for the armed forces of all countries. However, the radio has a flaw that can be easily intercepted. Therefore, the information must be encrypted before it can be “released” to the electromagnetic space and allowed to multiply by the speed of light traveling at the speed of light. “Transport aircraft” safely fly to the destination . Due to the significant intelligence value hidden in radiocommunications, warring parties have invested a great deal in listening and decoding. Pre-World War II Development After the telegraph and telephone were invented in succession, interception of communication lines became an important means of intercepting each other’s messages. In order to establish a communications network covering the global colony, the United Kingdom since the mid-19th century began to carry out large-scale submarine cable