US Patent No. 9,049,186

TRUSTED SECURITY ZONE RE-PROVISIONING AND RE-USE CAPABILITY FOR REFURBISHED MOBILE DEVICES


Patent No. 9,049,186
Issue Date June 02, 2015
Title Trusted Security Zone Re-provisioning And Re-use Capability For Refurbished Mobile Devices
Inventorship Lyle W. Paczkowski, Mission Hills, KS (US)
William M. Parsel, Overland Park, KS (US)
Carl J. Persson, Olathe, KS (US)
Matthew C. Schlesener, Shawnee, KS (US)
Assignee Sprint Communications Company L.P., Overland Park, KS (US)

Claim of US Patent No. 9,049,186

1. A method for creating a user specific trusted security zone key on a mobile device comprising:
after a mobile device, which was originally used by a first user, has been returned to factory settings because a second user
wishes to use the mobile device:

receiving, user input information;
hashing, the user input information with a trusted security zone master key to generate a user specific trusted security zone
key, wherein the hashing is completed using a one-way secure hash function;

communicating, the user input information to a trusted service manager;
verifying, the user specific trusted security zone key between the mobile device and the trusted service manager; and
using, the user specific trusted security zone key to access a trusted security zone on the mobile device, wherein the first
user of the mobile device used the trusted security zone master key when executing in the trusted security zone and the second
user uses the user specific trusted security zone key when executing in the trusted security zone.