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Center for Democracy and Technology
A public interest organization working for public policies that advance civil liberties and democratic values in information technologies. Contains links to information on free speech, data privacy, wiretapping, and cryptography.
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Cornell University: Experimental Study of Skype [Pdf]
This white paper on Skype describes and experimental study of the Skype Peer-to-Peer VoIP system. It particuarly focuses on the concept of supernodes, and how Skype differs fundamentally from earlier P@P systems that are oriented toward...
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Columbia University: Analysis of Skype Peer to Peer [Pdf]
This academic paper gives a very detailed, technical explanation of the Skype peer-to-peer internet telephony protocol. Diagrams are included that illustrate the Skype network and message flow. (2004)
Wikimedia
Wikipedia: Skype
This article introduces the reader to Skype, a peer-to-peer Internet telephony (VoIP) network.Skype users can speak to other Skype users for free.
Wikimedia
Wikipedia: Session Initiation Protocol (Sip)
An introduction to Session Initiation Protocol (SIP)that involves multimedia elements such as video, voice, instant messaging, online games, and virtual reality. It is one of the leading signaling protocols for Voice over IP.
Get Safe Online
Get Safe Online: Use Internet Telephony Safely
Internet telephony is using the internet for voice communication. It is also called voice over IP (VOIP). This site provides some tips on how to use VOIP safely and avoid loss of privacy.