Format preserving encryption methods for data strings with constraints

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United States of America Patent

PATENT NO 9489521
APP PUB NO 20150134972A1
SERIAL NO

14598536

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Abstract

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Format preserving encryption (FPE) cryptographic engines are provided for performing encryption and decryption on strings. A plaintext string may be converted to ciphertext by repeated application of a format preserving encryption cryptographic algorithm. Following each application of the format preserving cryptographic algorithm, the resulting version of the string may be analyzed to determine whether desired string constraints have been satisfied. If the string constraints have not been satisfied, further applications of the format preserving cryptographic algorithm may be performed. If the string constraints have been satisfied, the current version of the string may be used as an output for the cryptographic engine.

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Patent Owner(s)

Patent OwnerAddress
ENTIT SOFTWARE LLC500 WESTOVER DR #12603 SANFORD NC 27330

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Martin, Luther W San Jose, US 12 301
Pauker, Matthew J San Francisco, US 48 2485
Spies, Terence Mountain View, US 62 3445

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