Electrical computers and digital processing systems: support – Computer virus detection by cryptography
Reexamination Certificate
2005-12-08
2010-02-02
Smithers, Matthew B (Department: 2437)
Electrical computers and digital processing systems: support
Computer virus detection by cryptography
C726S022000, C711S163000
Reexamination Certificate
active
07657754
ABSTRACT:
Apparatus and methods are presented for protecting data in microcontrollers from both malicious software processes running inside the device as well as from unauthorized attempts to read the data from an external data bus and/or external memory. An illustrative embodiment of the invention accomplishes these security improvements, in part, by utilizing an enhanced memory management unit (MMU). The enhanced MMU is configured to prevent one software process running on the microcontroller from accessing data associated with a different software process running on the same microcontroller. Moreover, data transmitted over an external data bus or stored in an external memory is encrypted, thereby reducing the chances that unauthorized users will gain exploitable information from this data.
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Chambers Michael Joseph
Kiessling Michael
Tuchman Kenneth A.
Wang Hai
Agere Systems Inc
Ryan & Mason & Lewis, LLP
Smithers Matthew B
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