[FDE] Appropriate key lengths chart

[Robert Jueneman]

We have summarized our recommendations for key lengths in the referenced
chart.

C.f. http://www.spyrus.com/company/cryptomodernization.asp.

The Lenstra equations predict that ECC P-521 and AES-256 would be good
until the year 2282.  I'll be happy to personally guarantee them for
that long, but you might have trouble collecting from me if I'm wrong!

More realistically, all of these numbers are going to be highly suspect
and the existing algorithms completely broken if and when quantum
computing becomes a reality. The only problem is that we don't know IF
that will ever happen, nor WHEN.  

If NSA feels that high strength Suite B, meaning AES-256 and ECC P-384,
is good enough for Top Secret, then I feel comfortable in saying those
ought to be good for 30 to 50 years.  

Beyond that, no one really knows, but ECC P-521 and AES-256 are the best
that is available and standardized today.  

Will they be robust enough for 100+ years?  

I hope so, because I believe that certain Personally Identifiable
Information ought to be protected for the duration of a person's life,
and perhaps even longer in the case of genetic predisposition to certain
diseases that might be revealed through DNA testing.

Bob

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Today's Topics:

   1. Appropriate key lengths chart (Ali, Saqib)


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Date: Thu, 6 Mar 2008 09:40:38 -0800
From: "Ali, Saqib" <docbook.xml at gmail.com>
Subject: [FDE] Appropriate key lengths chart
To: fde <FDE at www.xml-dev.com>
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http://www.keylength.com/ provides charts for determining key lengths.
The key lengths are calculated using methods described by Arjen
Lenstra and Eric  Verheul in their paper titled "Selecting
Cryptographic Key Sizes"[1]

1. http://www.win.tue.nl/~klenstra/key.pdf


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