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A data security system and method for providing a cryptographic process such as the Data Encryption Standard comprises a microprocessor having a programmable hardware element such as a field programmable gate array interfaced to the processor bus. The predetermined ordered sequence of operations whi

A data security system and method for providing a cryptographic process such as the Data Encryption Standard comprises a microprocessor having a programmable hardware element such as a field programmable gate array interfaced to the processor bus. The predetermined ordered sequence of operations which form the cryptographic process are parsed into hardware-centric operations such as bit manipulations, table look-ups and logic operations which are efficiently performed in hardware, and into software-centric operations such as data processing and state machine control. Hardware-centric operations are performed in the programmable hardware device, and overall control of the system is performed under microprocessor control.

대표청구항 ▼

[ What is claimed is:] [1.] A data security system for performing a cryptographic process on data represented by bits, the cryptographic process comprising a predetermined repetitive sequence of steps which include bit manipulation operations comprising permutations of bits and substitutions of bits

[ What is claimed is:] [1.] A data security system for performing a cryptographic process on data represented by bits, the cryptographic process comprising a predetermined repetitive sequence of steps which include bit manipulation operations comprising permutations of bits and substitutions of bits and logical operations, the system comprising a microprocessor; a programmable hardware device connected to the microprocessor, the programmable hardware device comprising a plurality of elements connectable together under program control in different configurations of elements for performing different functions, the elements being connected to perform said bit manipulation and logical operations of said cryptographic processes; program means within the microprocessor for moving data to and from the hardware device and for controlling the hardware device to repetitively perform said bit manipulation and logical operations in accordance with said predetermined sequence of steps so as to perform said cryptographic process; and means for loading configuration information into the hardware device from the microprocessor upon start-up of the system to connect the elements to perform said operations.