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Re: [P1619-2] Proposed text for XML-based key backup

Yup -- EAD should be 'associated data' below:

We'll probably need to add 'associated data' to the definitions section.  I was just quickly skimming and grabbed the EAD term without fully reading it...

We also need to add IEEE Std 1619-2007 as a normative reference...

Cheers,
-Matt

On Tue, Jun 17, 2008 at 9:51 AM, David McGrew <mcgrew@cisco.com> wrote:
Hi Matt,

On Jun 17, 2008, at 8:37 AM, Matt Ball wrote:

Here is proposed text in fulfillment of the following action item:

AI 58, Matt: Look at 1619 and see if we can use the key backup structure for 1619.2. Provide text that goes to section 6 4 clause.

Proposed text against P1619.2/D3.  This replaces paragraph 4 in clause 6:


6.1 Exporting and archiving cryptographic keys

A P1619.2-compliant implementation may support a key backup structure as defined in this subclause.  If supported, the key backup structure shall follow the requirements in IEEE Std 1619-2007, Clause 7 "Exporting and archiving XTS-AES-128 and XTS-AES-256 keys" with the following modifications:
  1. The StandardNumber element (see 7.1.2 in IEEE std 1619-2007) shall be "IEEE STD 1619.2-####" {Editor's Note: Replace the #### with the actual year of publication of the standard}
  2. The EAD in this standard corresponds to the "Tweak" in IEEE Std 1619-2007.
Should "EAD" in the above read "Associated Data"?

David


  2. The TransformName element (see 7.1.5 in IEEE Std 1619-2007) shall be one of the following strings:
    1. "XCB-AES-128" - The XCB-AES transform (see 5.3) with a 128-bit AES key
    2. "XCB-AES-256" - The XCB-AES transform (see 5.3) with a 256-bit AES key
    3. "EME2-AES-128" - The XCB-AES transform (see 5.2) with a 48-byte EME2-AES key
    4. "EME2-AES-256" - The XCB-AES transform (see 5.2) with a 64-byte EME2-AES key
  3. The KeyLength element (see 7.1.6 in IEEE Std 1619-2007) shall be one of the following integers, according to the TransformName element:
    1. "XCB-AES-128" - KeyLength shall be 128
    2. "XCB-AES-256" - KeyLength shall be 256
    3. "EME2-AES-128" - KeyLength shall be 384
    4. "EME2-AES-256" - KeyLength shall be 512


--
Thanks!
Matt Ball, IEEE P1619.x SISWG Chair
M.V. Ball Technical Consulting, Inc.
Phone: 303-469-2469, Cell: 303-717-2717
http://www.mvballtech.com
http://www.linkedin.com/in/matthewvball




--
Thanks!
Matt Ball, IEEE P1619.x SISWG Chair
M.V. Ball Technical Consulting, Inc.
Phone: 303-469-2469, Cell: 303-717-2717
http://www.mvballtech.com
http://www.linkedin.com/in/matthewvball