NIST approval for AES-XTS

It look like the fact that AES-XTS will become an approved mode of AES is more than just a rumor. Last month, NIST posted a draft of SP 800-38E, Recommendation for Block Cipher Modes of Operation: The XTS-AES Mode for Confidentiality on Block-Oriented Storage Devices. SP 800-38E actually just refers to the IEEE P1616 standard, so it looks like NIST has essentially approved IEEE Std 1619-2007. The only additional requirement seems to be that a single key can't be used to encrypt more than 220 blocks of data.

NIST doesn't approve new modes of AES very often, so it's interesting to see what they think is worth of approval.

You can find the draft of SP 800-38E here.


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