Use same key for S/MIME and OpenPGP

[Raphaël Poss]

Hi all,

I'm just curious: since a RSA public key is made mainly of just two  
numbers, is it not possible (theoretically) to create both a valid  
PGP key and X509 certificate using the same key information, and use  
it with both protocols?

Also, is it not (theoretically) possible to convert X509 key  
certificates to PGP key signatures or vice-versa, based on the  
numerical values of the signing certificates/keys ?

If not, I would be interested to know what are the technical  
limitations.

Thanks in advance for any insight,

-- 
Raphael
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