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https://issues.apache.org/jira/browse/WSS-386?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13258459#comment-13258459
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Marc Giger commented on WSS-386:
--------------------------------
There is no proprietary compression algorithm. Just the
algorithm-identification url is proprietary
because the WSS-Standards don't define a compression transformation. So I
introduced the following
algorithm-uri's (which should be self-explanatory):
- http://www.apache.org/2012/04/xmlsec/gzip
- http://www.apache.org/2012/04/xmlsec/bzip2
- http://www.apache.org/2012/04/xmlsec/xz
- http://www.apache.org/2012/04/xmlsec/pack200";
Compression can (before or after encryption doesn't matter) be evil when
- someone sends a "Decompression bomb"
- someone sends an SOAP-Request with extremely deep repetitive XML tags and
compresses it (which will be a "decompression bomb" for WS)
- others?
Both have to be handled carefully in WSS.
> Introduce proprietary Compress-Transformation for Encryption / Decryption
> -------------------------------------------------------------------------
>
> Key: WSS-386
> URL: https://issues.apache.org/jira/browse/WSS-386
> Project: WSS4J
> Issue Type: Sub-task
> Reporter: Marc Giger
> Assignee: Marc Giger
> Priority: Minor
> Fix For: 2.0
>
>
> Compressing encrypted content (as usually done on transport layer) is not
> very efficient but plain XML is.
> Numbers:
> soap-doc-encrypted-not-compressed.xml = ~19M
> soap-doc-compressed-on-transport.gz = ~ 15M
> soap-doc-compressed-before-xml-encryption.xml = ~1.1M
> The advantages are:
> - Factor n less data on the wire
> - Faster processing on both side because much less data must be
> encrypted/decrypted (depends on encryption/compression algorithm)
> Disadvantages:
> - Proprietary
> - Introduces new attack-vector and will be disabled by default for WSS with
> the introduction of secure-processing
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