Great to see NIST take up a wide block cipher mode! At AWS we have to carefully engineer around the 128-bit safety limits. Otherwise hyper-scale systems like VPC, S3, and EBS would exceed those limits in seconds! 256-bits is much more misuse-proof.
https://csrc.nist.gov/News/2024/nist-proposes-to-standardize-wider-variant-of-aes
https://csrc.nist.gov/News/2024/nist-proposes-to-standardize-wider-variant-of-aes
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Also, have you got a link to Rijndael-256? It’s pretty much an ungoogleable thing now.
https://csrc.nist.gov/csrc/media/projects/cryptographic-standards-and-guidelines/documents/aes-development/rijndael-ammended.pdf