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Traffic analysis is the process of intercepting and examining messages in order to deduce information from patterns in communication. It can be performed even when the messages are encrypted and cannot be decrypted. In general, the greater the number of messages observed, or even intercepted and stored, the more can be inferred from the traffic. Traffic analysis can be performed in the context of military intelligence, counter-intelligence, or pattern-of-life analysis, and is a concern in computer security. Traffic analysis tasks may be supported by dedicated computer software programs. Advanced traffic analysis techniques may include various forms of social network analysis. == In military intelligence == In a military context, traffic analysis is a basic part of signals intelligence, and can be a source of information about the intentions and actions of the enemy. Representative patterns include: * Frequent communications — can denote planning * Rapid, short communications — can denote negotiations * A lack of communication — can indicate a lack of activity, or completion of a finalized plan * Frequent communication to specific stations from a central station — can highlight the chain of command * Who talks to whom — can indicate which stations are 'in charge' or the 'control station' of a particular network. This further implies something about the personnel associated with each station * Who talks when — can indicate which stations are active in connection with events, which implies something about the information being passed and perhaps something about the personnel/access of those associated with some stations * Who changes from station to station, or medium to medium — can indicate movement, fear of interception There is a close relationship between traffic analysis and cryptanalysis (commonly called codebreaking). Callsigns and addresses are frequently encrypted, requiring assistance in identifying them. Traffic volume can often be a sign of an addressee's importance, giving hints to pending objectives or movements to cryptanalysts. 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「Traffic analysis」の詳細全文を読む スポンサード リンク
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