Relatedly: there was a presentation about (reversing) Skype internals on BlackHat Europe 2006 (warning, PDF): http://www.blackhat.com/presentations/bh-europe-06

Relatedly: there was a presentation about (reversing) Skype internals on BlackHat Europe 2006 (warning, PDF): http://www.blackhat.com/presentations/bh-europe-06/bh-eu-06-biondi/bh-eu-06-biondi-up.pdf http://www.blackhat.com/presentations/bh-europe-06/bh-eu-06-... Skype probably updated their client/protocol since, but still an interesting read.