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What are biggest security threats of peer-to-peer apps technology?

Peer-to-peer applications like groove make a big play around encryption of stored data and data on the wire. What do you consider the biggest security threats for this kind of technology?
One of the main problems with peer-to-peer applications is the fact that they typically bypass the firewall. Take for instance the case where machine A (located outside the corporate network), is communicating with machine B inside the corporate network. If I were an attacker and wanted to gain access to the corporate network, I could try the "backdoor" approach by using the trusted connection between machine A and machine B to gain access, therefore bypassing any firewall protections they might have.

This was first published in February 2002

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