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https://issues.apache.org/jira/browse/LUCENE-9379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17353685#comment-17353685
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Martin Huber commented on LUCENE-9379:
--------------------------------------

[~rcmuir] thanks for the useful links. 

But I didn't say, that per directory or per user encryption would not be 
possible. This alone is not our usecase.

What I said is, that a user with root access to a system can read all files of 
all users while the users directories are mounted / unlocked. Or he can become 
the user and then see the files.

Is this statement not right ?

And such there is no privacy. 

> Directory based approach for index encryption
> ---------------------------------------------
>
>                 Key: LUCENE-9379
>                 URL: https://issues.apache.org/jira/browse/LUCENE-9379
>             Project: Lucene - Core
>          Issue Type: New Feature
>            Reporter: Bruno Roustant
>            Assignee: Bruno Roustant
>            Priority: Major
>          Time Spent: 2.5h
>  Remaining Estimate: 0h
>
> +Important+: This Lucene Directory wrapper approach is to be considered only 
> if an OS level encryption is not possible. OS level encryption better fits 
> Lucene usage of OS cache, and thus is more performant.
> But there are some use-case where OS level encryption is not possible. This 
> Jira issue was created to address those.
> ____________________________________________
>  
> The goal is to provide optional encryption of the index, with a scope limited 
> to an encryptable Lucene Directory wrapper.
> Encryption is at rest on disk, not in memory.
> This simple approach should fit any Codec as it would be orthogonal, without 
> modifying APIs as much as possible.
> Use a standard encryption method. Limit perf/memory impact as much as 
> possible.
> Determine how callers provide encryption keys. They must not be stored on 
> disk.



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