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SFS shares files between machines using cryptographically protected communication. As such, SFS can help eliminate security holes associated with insecure network file systems and let users share files where they could not do so before.
That said, there will very likely be security holes attackers can exploit because of SFS, that they could not have exploited otherwise. This chapter enumerates some of the security consequences of running SFS. The first section describes vulnerabilities that may result from the very existence of a global file system. The next section lists bugs potentially present in your operating system that may be much easier for attackers to exploit if you run SFS. Finally the last section attempts to point out weak points of the SFS implementation that may lead to vulnerabilities in the SFS software itself.