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Format-preserving encryption (FPE) refers to encrypting in such a way that the output has the same length as the input, or otherwise has the same format or structure as the input.

In cryptography, format-preserving encryption (FPE) refers to encrypting in such a way that the output is in the same format as the input. The "format" itself can be defined rather diverse: input and output can have the same length or another similarity and they would satisfy "FPE".

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