A related concept that I debated implementing, someday, is writing a
device driver that makes a Linux box look like a SCSI disk.
There are two non-trivial uses for this device:
1) it greatly simplifies some types of embedded system development.
The embedded system is designed to use a SCSI disk, but during
development the internal disk is replaced with an external host,
typically a developer's workstation. This totally eliminates
hassles downloading new files, uploading log files, etc.
2) the same approach can be used for stealth monitoring of extremely
sensitive systems. An attacker would only see a SCSI hard disk -
there is absolutely no way to know that this "disk" is actually
physically located and controlled by another system. The standard
driver would allow the monitoring system to continually cross-check
active and reference files. A somewhat more adventurous driver
could implement a type of data logging - the attacker may think
he's deleting files, but it monitoring system will retain a complete
-- Bear Giles firstname.lastname@example.org
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