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https://issues.apache.org/jira/browse/SPARK-47172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17838380#comment-17838380
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Steve Weis commented on SPARK-47172:
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[~mridulm80] What about 3.x? If we backported TLS support, that would be a
better option. I mentioned this before and it sounded like there was not
support for backporting TLS at this time.
> Upgrade Transport block cipher mode to GCM
> ------------------------------------------
>
> Key: SPARK-47172
> URL: https://issues.apache.org/jira/browse/SPARK-47172
> Project: Spark
> Issue Type: Improvement
> Components: Security
> Affects Versions: 3.4.2, 3.5.0
> Reporter: Steve Weis
> Priority: Minor
>
> The cipher transformation currently used for encrypting RPC calls is an
> unauthenticated mode (AES/CTR/NoPadding). This needs to be upgraded to an
> authenticated mode (AES/GCM/NoPadding) to prevent ciphertext from being
> modified in transit.
> The relevant line is here:
> [https://github.com/apache/spark/blob/a939a7d0fd9c6b23c879cbee05275c6fbc939e38/common/network-common/src/main/java/org/apache/spark/network/util/TransportConf.java#L220]
> GCM is relatively more computationally expensive than CTR and adds a 16-byte
> block of authentication tag data to each payload.
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