Patent ID: 7132923
Filing Date: 2006-11-07
Classification: G11C

Abstract:
1. A vehicle controller comprising, a rewritable memory configured to store a security function expressible as a first algebraic equation used to authenticate an external rewriting device to determine whether rewriting to the rewritable memory by the external rewriting device is permitted; a controller configured to initiate an authentication process to authenticate the external rewriting device by comparing a result of the security function with a security feature of the external rewriting device in response to a request from the external rewriting device to rewrite data held by the rewritable memory and upon authenticating the external rewriting device to delete the security function stored in the rewritable memory and to write a new security function into the rewritable memory; and an interface configured to receive and transmit one or more signals between the controller and the external rewriting device, wherein the new security function is different from the deleted security function.