Freescale Semiconductor,inc.

Amir K Daneshbeh

Thomas E Tkacik

An asymmetric cryptographic integrated circuitand a data processing devicein which the integrated circuitis used are disclosed. A security boundaryis confined to the interior of integrated circuit. A random number generatorwith a hardware entropy sourceand an arithmetic unitprogrammed through microcodeto perform a variety of cryptographically useful functions are included within security boundary. One of these functions is a primality tester. A controllerfor integrated circuitmay cause cryptographically sensitive data, such as large random prime numbers and a clear private key to be generated within the confines of security boundary. A symmetric key encryption engineis included within security boundaryand used to encrypt the clear private key so that a resulting encrypted private key may be stored outside security boundaryin a non-volatile memory

Asymmetric cryptographic device with local private key generation and method therefor

An electronic device as described herein implements a scheme to secure a data mapping function from scan access. The protection scheme can be used as a security measure for proprietary lookup tables, secret constants, digitally implemented algorithms, and the like. The electronic device employs a reconfigurable data mapping arrangement that can be reconfigured for a normal operating mode and a scan testing mode. While in the normal operating mode, a normal data mapping arrangement generates valid output data in accordance with the data mapping function. While in the scanning mode, however, a scanning data mapping arrangement generates invalid but testable output data in accordance with a data masking function that conceals, hides, masks, or obfuscates the data mapping function. Using the data masking function in this manner protects the data mapping function against reverse engineering attacks that attempt to derive the data mapping function from scan testing results.

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Austin, TX, United States of America

Amir K Daneshbeh