Request clarification of RFC 2440 algorithm list

[Keith Ray]

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Quoting Ryan Malayter <rmalayter@bai.org>:

> This is probably a Werner question, but someone else might know.
> 
> In RFC2440, one of the symmetric algorithm choices is ID=6, "Reserved
> for DES/SK"
> 
> What does the SK mean? "Single Key" would seem to be obvious, but I
> can't find this specified anywhere. I assume it's not an abbreviation
> for "Fanclub des SK Rapid Wien", which came up in my Google search.
> 
> If it is indeed single-key, 56-bit DES, I have to ask: why? To let
> OpenPGP implementations to comply with US export law?

The SK in SAFER SK stands for Stop Knudsen.  Lars Knudsen found a key
scheduling weakness in the original SAFER K-64.  The SAFER SK-128 cipher
in OpenPGP uses a 128-bit key.

  -- Keith

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