System and method for context switching of a cryptographic...

Details System and method for context switching of a cryptographic... System and method for context switching of a cryptographic...

2005-07-26

2009-10-20

Arani, Taghi T. (Department: 2438)

Cryptography

Particular algorithmic function encoding

Nbs/des algorithm

C455S072000, C370S202000, C370S521000, C713S150000, C713S168000, C713S174000, C713S186000

Reexamination Certificate

active

07606363

ABSTRACT:
A cryptographic system, method, and device for implementing cryptographic functions designed to protect data is provided. The method includes (a) providing an algorithm processing unit, (b) executing a cryptographic algorithm at the algorithm processing unit using a first cryptographic datum and input data to form output data, (c) determining if a context switch command is received from a controller, (d) receiving a second cryptographic datum from a memory if the context switch command is received, (e) replacing the second cryptographic datum with the first cryptographic datum if the context switch command is received, and (f) repeating (b)-(e). The controller switches the processing state of the algorithm processing unit from one channel to another channel without leaking data between channels through execution of the operations each time a channel switch is selected. As a result, a single algorithm processing unit used with a controller can provide multiple independent levels of security.

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