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Subject: [OASIS Issue Tracker] Commented: (OFFICE-3703) Proposal: ODF 1.3 Protection-Key Enhancements
[ http://tools.oasis-open.org/issues/browse/OFFICE-3703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=30689#action_30689 ]
Dennis Hamilton commented on OFFICE-3703:
-----------------------------------------
This issue has had some comments and discussion on the ODF TC List that are not visible here on the issue itself. To have relevant material in one place, here is a summary of the on-list discussion:
<https://lists.oasis-open.org/archives/office/201206/msg00027.html>
2012-06-13 Andre Rebentisch comment (not visible here) expressing a concern about intellectual property and need for a patent search
There are two replies:
<https://lists.oasis-open.org/archives/office/201206/msg00028.html> from me
<https://lists.oasis-open.org/archives/office/201206/msg00029.html> from David LeBlanc
<https://lists.oasis-open.org/archives/office/201206/msg00030.html> and afterthought from me
In David LeBlanc's response, there was also commentary on how an octet of the 160-bit salt was usurped as an identifier for the number of iterations to be used in SHA1DK. I explained the motivation in
<https://lists.oasis-open.org/archives/office/201206/msg00031.html>. and then
<https://lists.oasis-open.org/archives/office/201206/msg00032.html>
recommends having a fixed 32-bit iteration counter separate from the salt byte
> Proposal: ODF 1.3 Protection-Key Enhancements
> ---------------------------------------------
>
> Key: OFFICE-3703
> URL: http://tools.oasis-open.org/issues/browse/OFFICE-3703
> Project: OASIS Open Document Format for Office Applications (OpenDocument) TC
> Issue Type: Improvement
> Components: Security, Table, Text
> Affects Versions: ODF 1.0, ODF 1.0 (second edition), ODF 1.1, ODF 1.2, ODF 1.2 COS 1
> Environment: This is an enhancement, described in terms of changes to OpenDocument-v1.2-os.
> Reporter: Dennis Hamilton
> Assignee: Dennis Hamilton
> Fix For: ODF 1.3, ODF 1.3 CSD 01
>
>
> The use of password hashes in easily-discovered XML element and attribute values is subject to compromise of the hashed password. Although the use of increasingly-stronger digest algorithms may lengthen the time required for carrying out a brute-force attack on the hash, memorable passwords remain subject to compromise and the attack becomes easier as processor technology advances. Recent (June 2012) reveal that there is an explosive growth in hacks involving the discovery of passwords that are authenticated by use of unsalted digest algorithms.
>
> In addition, the presence of hashes in plain sight in XML documents allows the digest value to be easily compared with the same digest value elsewhere, revealing worthy targets to an adversary. In addition, the digest value is easily removed/replaced. And an extracted digest value can be repurposed for malicious purposes.
>
> This proposal introduces two protection-key digest algorithms, AUTHZ160 and SHA1DK that are intended to mitigate risks associated with use of digest algorithms and provision of the digests in plain view in XML documents. AUTHZ160, the recommended new default, uses protection-keys that are not derived from a password at all. They are 100% protection against discovery of an actual password known to the user by analysis of the protection-key alone. SHA1DK uses an AUTHZ160-sized cryptographically-random salt and an iterative key derivation procedure that makes discovery of a password by repeated trials very costly. (SHA1DK and an extension, SHA1DKX, can be used to create tear-off secret authenticators for AUTHZ160 protection keys, even though a protection-key that includes all of the SHA1DK result is password based.)
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