There are actually two public keys?

James P. Howard, II jh at
Mon May 18 23:49:40 CEST 2009

On Mon May 18 08:45:38 2009, R.A. Hettinga <rah at> wrote:

> The reason for it is a notion of what's called "key hygiene," and
> that's an important concept in RSA usage. That is the notion that one
> should never sign with an encryption key, and never encrypt with a
> signing key.

This leads indirectly to another question:  Why can't I sign someone
else's key with a subkey?  And on a divergent note, using the black
magic described elsewhere[1], is it bad to convert a subkey into a
primary key and use it to sign others?



James P. Howard, II, MPA
jh at

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