Secure end-of-life handling of electronic devices

Details Secure end-of-life handling of electronic devices Secure end-of-life handling of electronic devices

2007-12-21

2011-11-15

Chea, Philip (Department: 2492)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C726S009000, C713S170000, C707S698000

Reexamination Certificate

active

08060748

ABSTRACT:
Methods and apparatus for verifying that an electronic device has been disabled are disclosed. An exemplary electronic device includes a communications interface, a secure memory, storing a secret key, and a cryptographic circuit configured to calculate a verification token from the secret key, using a first cryptographic operation. The cryptographic circuit is further configured to calculate an identification token from the verification token, using a second cryptographic operation. The cryptographic circuit is further configured to output the identification token in response to a first command received via the communications interface. The verification token is output to the communications interface only if a predetermined functionality of the electronic device has been disabled. The electronic device may further comprise a disabling circuit configured to disable the predetermined functionality in response to a disable command.

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