Full Disclosure mailing list archives
about uncovering skype
From: 江晓林 <linjiangxiao () gmail com>
Date: Wed, 28 Dec 2005 20:02:12 +0800
HI: i have recently read the paper <Skype uncovered>,and have some questions.In the part of UDP packet deciphering,the writer had mentioned that "The RC4 key is generated using src/dst IP plus packet ID",and in the figure the writer showed that we could use the src/dst IP plus packet ID to generate the crc32,but in the former page,there had alread been a crc32,so,where did it come from,and how should do to generate the correct crc32. Besides, for the src ip,if the client was behind a NAT,its src ip would be modified by the router when the packet pass out the NAT,and the receiver would see another src ip,so how could it generate the right rc4 key? Finally,can somebody show me the deciphered data of the example,i wonde if mine is right or wrong. expecting for your reply. Sincerely, Jiangxiao
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