Format Preserving Encryption.docx

This leaved the fpe with only the 6 middle digits to

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This leaved the FPE with only the 6 middle digits to work with and of those only 1 out of 10 will work with the check digit. FPE uses the entire PAN and replaces the middle digits with a different random set of digits through a string cryptographic process called as pseudo-random permutation (PRP). [2] 4. FPE using Cycle Walking : In this algorithm, first a block cipher is applied to each of the inputs. If the output is not in set of allowed values for the input, block cipher will be applied again on that input, until the output ciphertext is in the allowed values. This pseudorandom permutation is one-to-one and the domain is finite, the iteration is guaranteed to stop. 5. FPE using Feistal Network : In this algorithm, the input is first split into two halves L1 and R1 and the following operations are performed on each half:
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Paudel 3 Here, a single key is used with a different tweak in each round, using the round count as the tweak.
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Paudel 4 “What Is Format Preserving Encryption and Is It Suitable for PCI DSS?” Control Gap , 26 Apr. 2017, controlgap.com/blog/format-preserving-encryption/.
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