Speaking of Skype Security

Here are some links to papers on Skype security:

• Silver Needle in the Skype
  
• An Analysis of the Skype Peer-to-Peer Internet Telephony Protocol
  
• VoIP and Skype Security
  

Also, Here is Dave Farber, Brad Templeton, et al, debating the subject: http://www.interesting-people.org/archives/interesting-people/200501/msg00235.html