Short Name |
Infrastructure:VOIP:SKYPE |
---|---|
Category |
Infrastructure |
Tags |
AppID1, AppID2 |
Release Date |
2009/10/19 |
Update Number |
1527 |
Supported Platforms |
idp-4.1+, isg-3.5+, j-series-9.5+, mx-11.4+, srx-12.1+, srx-branch-12.1+, vmx-17.4+, vsrx-12.1+, vsrx3bsd-18.2+ |
This signature detects Skype, which is a proprietary P2P VOIP network. It is a "complete black box" for both users and analyzers. It uses security through obscurity to make itself troublesome to analyze or reverse-engineer without a significant amount of work, or use of emulation. It uses AES block cipher, the RSA public key cryptosystem, the ISO 9796-2 signature padding scheme, the SHA-1 hash function, and the RC4 stream cipher through the communications between the client to client, client to supernodes and supernode to supernode.