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https://issues.apache.org/jira/browse/ARROW-16202?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17522414#comment-17522414
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Antoine Pitrou commented on ARROW-16202:
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Draft PR for a low-level helper here:
[https://github.com/apache/arrow/pull/12890]
> [C++][Parquet] WipeOutDecryptionKeys doesn't securely wipe out keys
> -------------------------------------------------------------------
>
> Key: ARROW-16202
> URL: https://issues.apache.org/jira/browse/ARROW-16202
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++, Parquet
> Affects Versions: 7.0.0
> Reporter: Antoine Pitrou
> Priority: Critical
> Fix For: 8.0.0
>
>
> {{InternalFileDecryptor::WipeOutDecryptionKeys()}} merely call
> {{std::string::clear}} to dispose of the decryption key contents, but that
> method is not guaranteed to clear memory (it probably doesn't, actually).
> We should probably devise a portable wrapper function for the various
> OS-specific memory clearing utilities.
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