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Can anyone give me some documentation on the various format preserving encryption modes?

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    $\begingroup$ Did you not find anything satisfying from your favorite search engine? Did you check out NIST-SP-800-38* series? Why did you believe [sha-256] tag is relevant here? $\endgroup$ – DannyNiu Nov 20 '20 at 9:27
  • $\begingroup$ I found my problem, thank you for giving me more information, that's great, thanks so much! $\endgroup$ – dang son Nov 22 '20 at 20:12
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I'm aware of only one official specification: NIST SP 800-38G, and recommend to ignore it. Rather, consider NIST SP 800-38Gr1-draft, still unofficial, if something next to a rubber stamp is badly needed.

That draft changes both modes in the official specification, FF1 and FF3, fixing security issues:

Note: the NSA reported that FF2 aka VAES3 of NIST SP 800-38G-draft has less than 128-bit security, NIST confirmed that and withdrew it.

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  • $\begingroup$ Great, your information was very helpful to me, thank you very much! $\endgroup$ – dang son Nov 22 '20 at 20:14

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