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Subject: [OASIS Issue Tracker] Updated: (OFFICE-3709) ODF 1.3: PackageEncryption Enhancements
[ http://tools.oasis-open.org/issues/browse/OFFICE-3709?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Dennis Hamilton updated OFFICE-3709:
------------------------------------
Summary: ODF 1.3: Package Encryption Enhancements (was: ODF 1.3: Package Encryption Start-Key Enhancement)
Proposal:
[Updated 2011-08-04]
Version 1.01 body of the proposal is maintained at http://www.oasis-open.org/committees/document.php?document_id=43085 , with specification of explicit changes to the text of these sections of ODF 1.2 for incorporation in ODF 1.3 CSD01 part 3:
A. Rationale
B. Proposed Changes
1. Front Page
2. Normative References
3. Section 4.8.3 manifest:checksum-type
4. Section 4.8.6 manifest:start-key-generation-name
C. Deployment Considerations
The proposal adds one new URI for a method that appends the manifest:salt to the user-specified password for digesting as the start key. The proposal adds a second new method that produces a manifest:checksum value that carries a salt and uses HMAC-SHA1 to produce the value for verifying that the decryption is correct.
was:
Version 1.00 body of the proposal is maintained at http://www.oasis-open.org/committees/document.php?document_id=43049 , with specification of explicit changes to the text of these sections of ODF 1.2 for incorporation in ODF 1.3 CSD01 part 3:
1. Front Page
2. Section 4.8.6 manifest:start-key-generation-name
The proposal adds one new URI for a method that appends the manifest:salt to the user-specified password for digesting as the start key.
Description:
In the default encryption method for packages, the same start-key, the SHA1 digest of the user-entered-password, is used for all key generations for encrypting the individual parts of the package. Although the start-key is a secret, its successful attack permits decryption of the entire package.
This proposal adds a method by which the start key is different for every key generation, relying on the cryptographically-random and different manifest:salt that is created for each key generation. This means that successful attack of one start key does not provide the start key for any of the other encryptions.
Note: This procedure does not materially impact attacks on the user-specified password, which remain at least as vulnerable as memorable passwords generally are.
In addition, the proposal adds an additional manifest:checksum-type that is salted in a way that avoids production of duplicate checksums for the same-plaintext files in different encrypted documents, reducing any attack surface that the detection of same-plaintext files may offer..
was:
In the default encryption method for packages, the same start-key, the SHA1 digest of the user-entered-password, is used for all key generations for encrypting the individual parts of the package. Although the start-key is a secret, its successful attack permits decryption of the entire package.
This proposal adds a method by which the start key is different for every key generation, relying on the cryptographically-random and different manifest:salt that is created for each key generation. This means that successful attack of one start key does not provide the start key for any of the other encryptions.
Note: This procedure does not materially impact attacks on the user-specified password, which remain at least as vulnerable as memorable passwords generally are.
The proposal title and the proposal statement have been changed to cover both manifest:checksum-type and manifest:start-key-generation-name being enhanced.
> ODF 1.3: Package Encryption Enhancements
> ----------------------------------------
>
> Key: OFFICE-3709
> URL: http://tools.oasis-open.org/issues/browse/OFFICE-3709
> Project: OASIS Open Document Format for Office Applications (OpenDocument) TC
> Issue Type: Improvement
> Components: Packaging, Part 3 (Packages), Security
> Affects Versions: ODF 1.2
> Environment: This is an enhancement, described in terms of changes to OpenDocument-v1.2-cs01-part3
> Reporter: Dennis Hamilton
> Assignee: Dennis Hamilton
> Fix For: ODF 1.3 CSD 01
>
>
> In the default encryption method for packages, the same start-key, the SHA1 digest of the user-entered-password, is used for all key generations for encrypting the individual parts of the package. Although the start-key is a secret, its successful attack permits decryption of the entire package.
> This proposal adds a method by which the start key is different for every key generation, relying on the cryptographically-random and different manifest:salt that is created for each key generation. This means that successful attack of one start key does not provide the start key for any of the other encryptions.
> Note: This procedure does not materially impact attacks on the user-specified password, which remain at least as vulnerable as memorable passwords generally are.
> In addition, the proposal adds an additional manifest:checksum-type that is salted in a way that avoids production of duplicate checksums for the same-plaintext files in different encrypted documents, reducing any attack surface that the detection of same-plaintext files may offer..
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