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https://issues.apache.org/jira/browse/SPARK-47172?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18067965#comment-18067965
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Gabor Roczei commented on SPARK-47172:
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[~aajisaka],
Thanks for the update! Glad to hear you're working on a fix. Please let us know
if you need any additional logs or testing from our side. Looking forward to
the PR!
> 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
> Assignee: Steve Weis
> Priority: Minor
> Labels: pull-request-available
> Fix For: 3.5.2, 3.4.4, 4.0.0
>
> Attachments: spark-4.1.1-AES-CTR-NoPadding-good.txt,
> spark-4.1.1-AES-GCM-NoPadding-authEngineVersion-1-bad.txt,
> spark-4.1.1-AES-GCM-NoPadding-authEngineVersion-2-bad.txt
>
>
> 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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