[113877] in cryptography@c2.net mail archive
Re: patent of the day
daemon@ATHENA.MIT.EDU (Florian Weimer)
Wed Jan 23 16:30:04 2008
To: "Ali, Saqib" <docbook.xml@gmail.com>
Cc: "Perry E. Metzger" <perry@piermont.com>, cryptography@metzdowd.com
From: Florian Weimer <fweimer@bfk.de>
Date: Wed, 23 Jan 2008 17:59:59 +0100
In-Reply-To: <addede3b0801222045x792cd91eu1bfde95977a78c45@mail.gmail.com> (Saqib Ali's message of "Tue, 22 Jan 2008 20:45:01 -0800")
* Saqib Ali:
> can anyone please shed more light on this patent. It seems like a
> patent on the simple process of cryptographic erase......
Exactly. Niels Provos, "Encrypting Virtual Memory", USENIX Security
2000, looks like something pretty close to prior art:
| We investigate several alternative solutions to prevent confidential
| data from remaining on backing store, e.g. erasing data physically
| from the backing store after pages on it become unreferenced.
| However, we find that encryption of data on the backing store with
| volatile random keys has several advantages over other approaches:
|=20
| * The content of a page disappears when its respective encryption key
| is deleted, a very fast operation. [...]
AFAICS, the patent does not reference the paper.
--=20
Florian Weimer <fweimer@bfk.de>
BFK edv-consulting GmbH http://www.bfk.de/
Kriegsstra=DFe 100 tel: +49-721-96201-1
D-76133 Karlsruhe fax: +49-721-96201-99
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