A system (10) and a method for securing an integrated circuit each have at least three modes of security. A first mode of security is a normal mode of operation wherein access to data which is internal to the integrated circuit is not limited. The normal mode of security may be readily changed to a revocable...http://www.google.de/patents/US5432950?utm_source=gb-gplus-sharePatent US5432950 - System for securing a data processing system and method of operation
