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Re: I-D ACTION:draft-ietf-smime-idea-00.txt

1999-03-31 15:16:37

The reason for this requirement is that Ephemeral-Static Diffie-Hellman
(E-S D-H) is the mandatory to implement key management algorithm.  The
output of E-S D-H is a KEK.  So, the mandatory to implement key management
algorithm requires a way to wrap the CEK in the resulting pairwise KEK.


At 05:24 PM 3/31/99 +0000, Dr Stephen Henson wrote:
Is there a potential conflict with CMS 12.3.1? That is:

  Any symmetric encryption algorithm that a CMS implementation includes
  as a content-encryption algorithm must also be included as a key-
  encryption algorithm.  

As I understand this this means that a CMS implementation using IDEA
must also include a means to wrap content encryption keys with IDEA.
This would require additional information and a new OID
id-alg-CMSIDEAwrap for example.

Dr Stephen N. Henson.
Personal Email: shenson(_at_)drh-consultancy(_dot_)demon(_dot_)co(_dot_)uk 
Senior crypto engineer, Celo Communications:
Core developer of the   OpenSSL project:
Business Email: drh(_at_)celocom(_dot_)com PGP key: via homepage.

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