Patent ID: 8209550
Filing Date: 2012-06-26
Classification: G06F,H04L,H04W

Abstract:
1. An electronic device comprising: a non-secure first memory for storing usage restriction data including: static usage restriction data comprising one or more authorization keys, each said key governing a corresponding device usage restriction setting; dynamic usage restriction data comprising said device usage restriction settings, with changes to each said restriction setting governed by the corresponding authorization key; a first message authentication code for authenticating said static usage restriction data; and a second message authentication code for authenticating said dynamic usage restriction data; a secure circuit holding a permanent device key accessible only through a direct connection to the secure circuit, and further holding a one-time programmable initialization indicator; a cryptographic circuit coupled to said secure circuit via said direction connection, and wherein said cryptographic circuit is configured to obtain said permanent key from said secure circuit for cryptographic processing by said cryptographic circuit but not to make said permanent key available to any other circuitry in said electronic device; and a system processor configured to selectively operate in a secure mode for securely accessing said cryptographic circuit, and in non-secure mode for non-securely accessing said cryptographic circuit; and wherein said cryptographic circuit is configured to: