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Sixth USENIX Security Symposium
A Revocable Backup System
Dan Boneh and Richard Lipton
Department of Computer Science
Princeton University
Princeton, NJ
Abstract
We present a system which enables a user to remove a file from both
the file system and all the backup tapes on which the file is stored.
The ability to remove files from all backup tapes is desirable in many
cases. Our system erases information from the backup tape without
actually writing on the tape. This is achieved by applying
cryptography in a new way: a block cipher is used to enable the system
to ``forget'' information rather than protect it. Our system is easy
to install and is transparent to the end user. Further, it introduces
no slowdown in system performance and little slowdown in the backup
procedure.
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