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Skype is a Voice over Internet Protocol (VoIP) system developed by Skype Technologies S.A. It is a peer-to-peer network in which voice calls pass over the Internet rather than through a special purpose network. Skype users search for other users to connect to, enabling them to search for other Skype users and send them messages. Skype uses 256 bit AES encryption to encrypt communication between users, complicating the decryption of these communications, although when calling a telephone or mobile, the part of the call over the PSTN is not encrypted.〔(【引用サイトリンク】title=Does Skype use encryption? )〕 Skype's encryption is inherent in the Skype Protocol and is transparent to callers. Skype is not considered to be a secure VoIP system and the calls made over the network are routinely monitored by Microsoft and by Government agencies.〔(【引用サイトリンク】publisher=The Guardian )〕 == Security policy == The company's security policy includes: #Usernames are unique. #Callers must present a username and password or other authentication credential. #Each caller provides the other with proof of identity and privileges whenever a session is established. Each verifies the other’s proof before the session is allowed to carry messages. #Messages transmitted are encrypted from caller to caller. No intermediate node (router) has access to the meaning of these messages. This claim has been undermined in May 2013 by evidence that Microsoft (owner of Skype) has pinged unique URLs embedded in a Skype conversation; this could only happen if Microsoft has access to the unencrypted form of these messages. 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「Skype security」の詳細全文を読む スポンサード リンク
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