Unauthorized modification of values stored in flash memory

Details Unauthorized modification of values stored in flash memory Unauthorized modification of values stored in flash memory

2006-08-15

2006-08-15

Darrow, Justin T. (Department: 2132)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

Tamper resistant

C713S176000, C713S193000, C380S264000

Reexamination Certificate

active

07093139

ABSTRACT:
The invention is a method and system in which an authentication chip having secret information stored within it, including secret data stored in multi-level flash memory, is protected from unauthorized modification of values stored in the flash memory. The secret information is stored using an internal command and can only be accessed by one or more further commands. Secret data in the information is stored in intermediate states of the multilevel flash memory between the minimum and maximum voltage level states. A validity check is performed on secret data items before allowing them to be read out by a command accessing them. The validity check involves calculation of a checksum and comparison of the result with a checksum stored using the internal command as part of the secret information.

REFERENCES:
patent: 5787367 (1998-07-01), Berra
patent: 6374354 (2002-04-01), Walmsley et al.
patent: 6615355 (2003-09-01), Mattison
patent: 6757832 (2004-06-01), Silverbrook et al.
patent: 11345286 (1999-12-01), None
patent: 2000163547 (2000-06-01), None

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