This is an audio version of the Wikipedia Article:
00:01:51 1 Origins
00:04:20 2 World War I
00:06:43 2.1 Cracking the German naval codes
00:13:05 2.2 Direction finding
00:16:45 2.3 Zimmermann Telegram & Other Successes
00:19:12 3 Interwar period
00:19:56 3.1 United Kingdom
00:22:41 3.2 Germany
00:23:44 3.3 United States
00:25:47 4 World War II
00:28:59 4.1 British SIGINT
00:33:57 4.1.1 German codes
00:39:52 4.1.2 Italian codes
00:42:14 4.1.3 Japanese codes
00:44:09 4.2 US SIGINT
00:46:37 4.2.1 Japanese codes
00:51:04 5 Cold War
00:52:45 5.1 US Tactical SIGINT
00:56:48 6 Recent history
00:58:20 6.1 Threat from terrorism
01:02:41 6.2 European Space Systems cooperation
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Speaking Rate: 0.7999695861778456
Voice name: en-GB-Wavenet-A
"I cannot teach anybody anything, I can only make them think."
SIGINT is a contraction of SIGnals INTelligence. Before the development of radar and other electronics techniques, signals intelligence and communications intelligence (COMINT) were essentially synonymous. Sir Francis Walsingham ran a postal interception bureau with some cryptanalytic capability during the reign of Elizabeth I, but the technology was only slightly less advanced than men with shotguns, during World War I, who jammed pigeon post communications and intercepted the messages carried.
Flag signals were sometimes intercepted, and efforts to impede them made the occupation of the signaller one of the most dangerous on the battlefield. The middle 19th century rise of the telegraph allowed more scope for interception and spoofing of signals, as shown at Chancellorsville.
Signals intelligence became far more central to military (and to some extent diplomatic) intelligence generally with the mechanization of armies, development of blitzkrieg tactics, use of submarine and commerce raiders warfare, and the development of practicable radio communications. Even Measurement and Signature Intelligence (MASINT) preceded electronic intelligence (ELINT), with sound ranging techniques for artillery location. SIGINT is the analysis of intentional signals for both communications and non-communications (e.g., radar) systems, while MASINT is the analysis of unintentional information, including, but not limited to, the electromagnetic signals that are the main interest in SIGINT.