Cryptography – Particular algorithmic function encoding
Reexamination Certificate
2011-01-04
2011-01-04
Patel, Ashok B (Department: 2491)
Cryptography
Particular algorithmic function encoding
C380S037000, C713S189000, C713S193000
Reexamination Certificate
active
07864952
ABSTRACT:
A data processing system is provided that includes format-preserving encryption and decryption engines. A string that contains characters has a specified format. The format defines a legal set of character values for each character position in the string. During encryption operations with the encryption engine, a string is processed to remove extraneous characters and to encode the string using an index. The processed string is encrypted using a format-preserving block cipher. The output of the block cipher is post-processed to produce an encrypted string having the same specified format as the original unencrypted string. During decryption operations, the decryption engine uses the format-preserving block cipher in reverse to transform the encrypted string into a decrypted string having the same format.
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Martin Luther W.
Pauker Matthew J.
Spies Terence
Patel Ashok B
Potratz Daniel
Ru Nancy Y.
Treyz G. Victor
Treyz Law Group
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