System and method for using dummy cycles to mask operations...

Details System and method for using dummy cycles to mask operations... System and method for using dummy cycles to mask operations...

2008-05-13

2008-05-13

Le, Don (Department: 2819)

Electronic digital logic circuitry

Security

C326S046000, C326S093000

Reexamination Certificate

active

11243329

ABSTRACT:
A secure device includes a memory capable of storing information. The secure device also includes a secure microcontroller capable of securing the information in the memory. The secure microcontroller includes a plurality of registers. The secure microcontroller also includes combinatorial logic capable of receiving at least one output value provided by at least one of the registers. The combinatorial logic is also capable of performing one or more combinatorial operations using the at least one received output value. In addition, the secure microcontroller includes dummy cycle circuitry capable of causing one or more of the registers and the combinatorial logic to change state and consume current during one or more dummy cycles.

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