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https://issues.apache.org/jira/browse/HDFS-6134?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14044428#comment-14044428
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Owen O'Malley commented on HDFS-6134:
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Sorry, I messed up my math. Assuming that you have 1million files per key and 8 
bytes of randomness, you get 2.7e-8, which is close enough to 0. At 16 bytes or 
32 bytes of randomness, doubles underflow when calculating the percentage.


> Transparent data at rest encryption
> -----------------------------------
>
>                 Key: HDFS-6134
>                 URL: https://issues.apache.org/jira/browse/HDFS-6134
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>          Components: security
>    Affects Versions: 2.3.0
>            Reporter: Alejandro Abdelnur
>            Assignee: Alejandro Abdelnur
>         Attachments: HDFSDataatRestEncryptionProposal_obsolete.pdf, 
> HDFSEncryptionConceptualDesignProposal-2014-06-20.pdf
>
>
> Because of privacy and security regulations, for many industries, sensitive 
> data at rest must be in encrypted form. For example: the health­care industry 
> (HIPAA regulations), the card payment industry (PCI DSS regulations) or the 
> US government (FISMA regulations).
> This JIRA aims to provide a mechanism to encrypt HDFS data at rest that can 
> be used transparently by any application accessing HDFS via Hadoop Filesystem 
> Java API, Hadoop libhdfs C library, or WebHDFS REST API.
> The resulting implementation should be able to be used in compliance with 
> different regulation requirements.



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