Talk:Skype protocol

Tools used

Baset and Schulzrinne used:

• Ethereal
• NetPeeker.

Biondi and Desclaux used:

• PytStop to circumvent checksums
• Skype checks for SoftICE to prevent debugging. However RR0d debugger works.
• Scapy interactive packet manipulation program
• shellcode Oracle Revelator in Shellforge
• IPQUEUE
• SIRINGE
• Skypy : a scapy wrapper to reassemble and decode obfuscated TCP streams (not released?)

Techniques used to defend the Skype binary

Skype relies heavily on code obfuscation:

• Much of the skype binary is encrypted. It provides its own unpacker which erases the original import table as it is loaded.
• Code integrity checksums, executed randomly, and obfuscated with random lengths and random operators
• Anti-debuggers
  • attempt to identify breakpoints and trap the debugger.
  • target specific debuggers by checking for certain loaded drivers
• General code obfuscation with fake error handlers that directly manipulate memory and registers. —The preceding unsigned comment was added by Pgr94 (talk • contribs) 14:11, 7 December 2006 (UTC).

Skype protocol implementations

Can someone who knows please add a section listing implementations? I'm not talking about wrappers around the Skype binary client, but actual new code. The official client is obviously an implementation, it appears ++skype may also be one. Are there any others?

I'm not really sure what ++skype is. Is it just a wrapper? I'm not aware of any other implementations, but would also be interested to know if anyone has started a GPL project. Pgr94 17:14, 27 May 2007 (UTC)

According to User:217.162.207.65 "++Skype library is a library for the API of the software and not for the network." Pgr94 09:51, 18 June 2007 (UTC)

Fair use rationale for Image:Skype logo.png

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