Re: [dnsext] New Version Notification for draft-mcgrew-tss-02 (fwd)

[Michael StJohns <[e-mail]>]

Hi Alfred -

A better scheme for threshold signing for the root might be the Shoup paper: "Practical Threshold Signatures", Victor Shoup ([e-mail]), IBM Research Paper RZ3121, 4/30/99

The major difference between the two is that the Shamir system (which you describe) requires the base secret (private key) be reconstituted (by a trusted entity) before it can be used, where the Shoup system allows partial signatures with a public gather function.  E.g. In a 3 of 5 system, each of the 3 key share holders partial-sign the data using their share of the private key and send it (as public data) to a central location where a gather function is used to form the actual signature.  

Shamir is nice in that it can be used for any set of key bits.  But the reconstitution requirement is a point of weakness where the actual private key may be compromised.

The Shoup system is only specified for RSA as far as I know. 

Mike



At 10:48 PM 3/9/2009, Alfred =?hp-roman8?B?SM5uZXM=?= wrote:
>This tools might be of interest for implementors of DNSSEC,
>e.g. the folks wanting to distibute control over the future Root
>Zone primary Key Signing Keys between the RIRs and ICANN/IANA.
>
>The new version should hopefully be ready for implementation.
>
>
>----- Forwarded message from IETF I-D Submission Tool -----
>
>> From: IETF I-D Submission Tool <[e-mail]>
>> Message-Id: <[e-mail]>
>> Date: Mon,  9 Mar 2009 13:44:24 -0700 (PDT)
>> Subject: New Version Notification for draft-mcgrew-tss-02
>
>A new version of I-D, draft-mcgrew-tss-02.txt has been successfuly
>submitted by David McGrew and posted to the IETF repository.
>
>Filename:       draft-mcgrew-tss
>Revision:       02
>Title:          Threshold Secret Sharing
>Creation_date:  2009-03-09
>WG ID:          Independent Submission
>Number_of_pages: 26
>
>Abstract:
>Threshold secret sharing (TSS) provides a way to generate N shares
>from a value, so that any M of those shares can be used to
>reconstruct the original value, but any M-1 shares provide no
>information about that value.  This method can provide shared access
>control on key material and other secrets that must be strongly
>protected.
>
>This note defines a threshold secret sharing method based on
>polynomial interpolation in GF(256) and a format for the storage and
>transmission of shares.  It also provides usage guidance, describes
>how to test an implementation, and supplies test cases.
>
>
>The IETF Secretariat.
>
>
>----- End of forwarded message from IETF I-D Submission Tool -----
>
>
>Kind regards,
>  Alfred.
>
>-- 
>
>+------------------------+--------------------------------------------+
>| TR-Sys Alfred Hoenes   |  Alfred Hoenes   Dipl.-Math., Dipl.-Phys.  |
>| Gerlinger Strasse 12   |  Phone: [phone], Fax: -18         |
>| D-71254  Ditzingen     |  E-Mail:  [e-mail]                     |
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