[OASIS Issue Tracker] Created: (OFFICE-3709) ODF 1.3: PackageEncryption Start-Key Enhancement

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

ODF 1.3: Package Encryption Start-Key Enhancement
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                 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.

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