Information security – Protection of hardware
Reexamination Certificate
2006-06-06
2006-06-06
Peeso, Thomas R. (Department: 2132)
Information security
Protection of hardware
C714S763000, C711S166000
Reexamination Certificate
active
07058980
ABSTRACT:
An electronic device for storing protected data is disclosed. The electronic device includes memory protection logic operable to interface with memory, such as non-volatile ROM for storing protected data therein. The protected data in one embodiment is program code. The access to the protected data is restricted by a local processor, such as a microcontroller or microprocessor for execution thereon within the electronic device. Further, the electronic device includes validation logic operative in a first mode, for checking the validity of the data and for producing a validity signal, such as a checksum, enabled to determine whether that data is valid. In order to prevent access to intermediate validity calculations which may allow an individual to gain knowledge of the protected data, a validity signal output control is provided for inhibiting an output of the validity signal to outside the device until the validity of a predetermined quantity of the protected data has been checked. This predetermined quantity is made sufficiently large and preferably equal to all of the protected data. In another embodiment, a reset for setting the contents of the validity signal if the checking is interrupted is also included.
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Davidescu Dragos
Link Jean-Francois
Dinh Minh
Fleit Kain Gibbons Gutman Bongini & Bianco P.L.
Gibbons Jon A.
Jorgenson Lisa K.
Peeso Thomas R.
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