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https://issues.apache.org/jira/browse/COLLECTIONS-750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17053846#comment-17053846
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Chen Guoping commented on COLLECTIONS-750:
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Thanks to Alex Herbert. This issue maybe fixed by the pull 
+https://github.com/apache/commons-collections/pull/133/commits/8b4ecbc084eaf8e61f002612f7ca156fcc1e107e+

> Add a Bloom filter Hasher implementation that minimizes information leakage
> ---------------------------------------------------------------------------
>
>                 Key: COLLECTIONS-750
>                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-750
>             Project: Commons Collections
>          Issue Type: Improvement
>          Components: Collection
>    Affects Versions: 4.5
>            Reporter: Claude Warren
>            Priority: Minor
>
> The current implementations of Hasher either leak the contents that are being 
> hashed or are fixed to a specific shape.  This change is to add a Hasher that 
> only tracks the hashed values so that secure systems may use the Bloom filter 
> implementation without fear of information leakage beyond that of the hashed 
> values.



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