First and foremost, information on encrypted file systems and their relative merits and support is few and far between. It is a complicated topic and discussions about benefits of one over another can be convoluted and confusing.
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TCFS and CFS are both encrypted file systems based on the NFS interface. TCFS is enabled as a kernel module and CFS is enabled at user level. My experience with CFS is that it can be very slow, but I can only speak to its use on Linux platforms, not BSD or Solaris. Unfortunately, I have not used TCFS so I can't provide a comparison between the two.
My personal preference for an encrypted file system is dm-crypt. It is a secure and modern solution that is well integrated into the Linux 2.6 kernel.
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