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Well, your requirements sound pretty much like standard disk encryption ones. Assuming you can assign IDs (0,1,2...) to each 4kiB sector implicitely.In this case you could simply use XTS-mode of encryption using AES. You'd then iterate through the 4kiB block using the inner counter and iterate through all sectors using the outer counter. This should give ...


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Yes. They're called Format-Preserving Encryption schemes, and this is the best known construction of that.



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