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A canary trap is a method for exposing an information leak by giving different versions of a sensitive document to each of several suspects and seeing which version gets leaked. Special attention is paid to the quality of the prose of the unique language, in the hopes that the suspect will repeat it verbatim in the leak, thereby identifying the version of the document. The term was coined by Tom Clancy in his novel ''Patriot Games'', although Clancy did not invent the technique. The actual method (usually referred to as a barium meal test in espionage circles) has been used by intelligence agencies for many years. The fictional character Jack Ryan describes the technique he devised for identifying the sources of leaked classified documents:
A refinement of this technique uses a thesaurus program to shuffle through synonyms, thus making every copy of the document unique. ==Known canary trap cases== Following the troubled production of ''Star Trek:The Motion Picture'' in the late 1970s, Paramount Pictures effectively replaced Gene Roddenberry as producer of further movies in the franchise with Harve Bennett. Roddenberry was retained as an "executive consultant", due to the high regard the series' fans held him in; while he had little real authority he was still kept involved in the creative process. The fans often complained about particular plot developments proposed for the films, such as the death of Spock in ''Star Trek II'', that Roddenberry had opposed. So, before any drafts of the screenplay for ''Star Trek III: The Search for Spock'' were circulated, Bennett arranged for each individual copy to have subtle clues distinguishing it from the others. Shortly after Roddenberry opposed the destruction of the ''Enterprise'' at the climax of that film, fans began to complain to Paramount and Bennett. He found that a leaked copy of the script was the one given to Roddenberry, but was unable to do anything about it. After a series of leaks at Tesla Motors in 2008, CEO Elon Musk reportedly sent slightly different versions of an e-mail to each employee in an attempt to reveal potential leakers. The e-mail was disguised as a request to employees to sign a new non-disclosure agreement. The plan backfired when the company's general counsel forwarded his own unique version of the e-mail with the attached agreement. As a result, Musk's scheme was realized by employees who now had a safe copy to leak. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「canary trap」の詳細全文を読む スポンサード リンク
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