Hewlett-packard Development Company, L.P.

Other

Mark Corio

Keith Alexander Harrison

Gary A Schwenck

Mark L Wambach

Jim Colton

A tamper-evident and/or tamper-resistant electronic module comprising an electronic component embedded in an encapsulant material and at least one thin sheet of frangible material contacting and overlying said encapsulant material and overlying said component, said sheet being sufficiently thin that it is likely to crack or break if an attempt is made to drill or cut through it with a laser drill.

Tamper-evident and/or tamper-resistant electronic components

A tamper evident electronic module comprises an electronic component, a tamper evident sheet, and encapsulant material. Said component is encapsulated in the encapsulant material and the sheet overlies the component, and the sheet comprises a flexible multi-layer sheet, a plurality of the layers of the sheet being selected from the group below:

Tamper-evident/tamper-resistant electronic components

The invention is embodied in a computer including a memory and a memory protector responsive to a list of key memory locations containing information to be protected, the memory protector including (a) a write protection circuit&mdash;operating independently of the computer&mdash;which prevents any write requests specifying the memory locations contained in the list from being carried out, and (b) a manual protect enable switch for enabling and temporarily disabling the write protection circuit, thus allowing special or temporary access to the protected memory locations. The write protection circuit may be implemented as a programmed microprocessor with its program stored in a non-volatile read-only memory, or as a dedicated hard-wired logic circuit, such as a field programmable gate array. The list of key memory locations may be stored in a non-volatile memory accessed by the write protection circuit. More conveniently, the list is contained in a protected memory location (i.e., a memory location specified on the list itself), the list being downloaded to the write protection circuit.

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Rochester, NY, United States of America

Mark Corio