Secure transaction microcontroller with secure boot loader

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO RE47621
SERIAL NO

15189972

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Abstract

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A high security microcontroller (such as in a point of sale terminal) includes tamper control circuitry for detecting vulnerability conditions: a write to program memory before the sensitive financial information has been erased, a tamper detect condition, the enabling of a debugger, a power-up condition, an illegal temperature condition, an illegal supply voltage condition, an oscillator fail condition, and a battery removal condition. If the tamper control circuitry detects a vulnerability condition, then the memory where the sensitive financial information could be stored is erased before boot loader operation or debugger operation can be enabled. Upon power-up if a valid image is detected in program memory, then the boot loader is not executed and secure memory is not erased but rather the image is executed. The tamper control circuitry is a hardware state machine that is outside control of user-loaded software and is outside control of the debugger.

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Patent Owner(s)

  • MAXIM INTEGRATED PRODUCTS, INC.

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chock, Raymond O San Jose, US 23 351
Hess, Mark San Francisco, US 10 240
Hsiang, Peter C Santa Clara, US 4 127

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