The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 15, 2011
Filed:
Dec. 21, 2007
Petri Mikael Johansson, Bjärred, SE;
Per Ståhl, Klagshamn, SE;
Petri Mikael Johansson, Bjärred, SE;
Per Ståhl, Klagshamn, SE;
Telefonaktiebolaget LM Ericsson (publ), Stockholm, SE;
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.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile