man cfssh (Commandes) - (somewhat) secure CFS shell
NAME
cfssh - (somewhat) secure CFS shell
SYNOPSIS
cfssh directory
DESCRIPTION
cfssh uses cattach(1) to associate the encrypted directory (previously created with cmkdir(1)) with a randomly selected name. Once the correct passphrase is provided, cfssh invokes a new shell with the random directory in /crypt as its working directory. When the shell exits, the temporary attach name is deleted with cdetach(1). Since the generated names are somewhat obscure and are hidden from view with CFS's "." mechanism, casual attackers cannot easily exploit the attached cleartext even if they can spoof the UID of the user.
SEE ALSO
BUGS
The temporary names generated are not random in any cryptographically strong sense, so this command should really only be viewed as an example. A determined attacker could probably guess the generated name by exploiting the known properties of the way the ksh random function is seeded.
There's no hiding from an attacker who can compromise root on the client system while an attach is active.
AUTHOR
Matt Blaze; for information on cfs, email to cfs@research.att.com.