Subject: R: key usage - key encipherment or data encipherment

From: "Santoni Adriano" <[email-masked]>
Date: Fri, 13 May 2005 08:42:54 +0200

I'd suggest to modify the first part like follows (or equivalently):

      The keyEncipherment bit is asserted when the subject public key is
      used for enciphering private or secret keys, i.e., for key transport.
      For example, this bit shall be set when a RSA public key is to be
      used for encrypting a symmetric content-decryption key or an
      asymmetric private key (e.g. as it occurs in the TLS protocol with
      the server's public key).

This would add another bit of clarity to the prescription.

My 2 cents (of Euro :-)

Adriano

-----Messaggio originale-----
Da: [email-masked] [mailto:[email-masked]] Per conto di Russ Housley
Inviato: giovedì 12 maggio 2005 21.21
A: [email-masked]
Oggetto: Re: key usage - key encipherment or data encipherment

There has been a whole lot of discussion about these paragraphs.  Since 
some of the discussion has not been CCed to the PKIX mail list, I am 
posting the resulting words.

      The keyEncipherment bit is asserted when the subject public key is
      used for enciphering private or secret keys, i.e., for key transport.
      For example, this bit shall be set when a RSA public key is to be
      used for encrypting a symmetric content-decryption key or an
      asymmetric private key.

     The dataEncipherment bit is asserted when the subject public key
     is used for directly enciphering raw user data without the use of
     an intermediate symmetric cipher. Note that the use of this
     bit is extremely uncommon; almost all applications use
     key transport or key agreement to establish a symmetric key.

I hope we a re close to closure on this one....

Russ

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