Patent · US Active

Data processing systems with format-preserving encryption and decryption engines

US7864952B2 · kind B2 · utility

57Cited by

3References

15Claims

0Family size

Assignee

Voltage Security, Inc. · US

Inventors

Matthew J. Pauker · San Francisco, US
Terence Spies · San Mateo, US
Luther Martin · Champaign, US

Key dates

Filing date	Dec 6, 2006
Grant date	Jan 4, 2011
Priority date	—
Expiry date	Feb 20, 2029

Classification

Technology area (CPC H)Electricity
CPC primaryH04L2209/56
WIPO fieldDigital communication
WIPO sectorElectrical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.