arXiv:cs/0412017cs.NI
An Analysis of the Skype Peer-to-Peer Internet Telephony Protocol
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Abstract
Skype is a peer-to-peer VoIP client developed by KaZaa in 2003. Skype claims that it can work almost seamlessly across NATs and firewalls and has better voice quality than the MSN and Yahoo IM applications. It encrypts calls end-to-end, and stores user information in a decentralized fashion. Skype also supports instant messaging and conferencing. This report analyzes key Skype functions such as login, NAT and firewall traversal, call establishment, media transfer, codecs, and conferencing under three different network setups. Analysis is performed by careful study of Skype network traffic.
> Essentially the government has built a surveillance state by outsourcing it to private enterprise. This has been going on for a long time. A decade ago, Microsoft purchased Skype and converted it from secure peer-to-peer[0][1] to sending all user data unencrypted through their…
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