Security within integrated circuits

摘要

A method for hindering detection of secret information unintentionally leaked from a secret held in a memory unit, the method comprising: storing the secret information in a location within the memory unit; episodically re-deriving the secret information; and storing the re-derived secret information at the location within the memory unit, wherein the episodic re-deriving of the secret information causes an episodic change of physical contents of the memory unit holding the secret information, thereby causing the secret information unintentionally leaked from the memory unit to vary over time causing any detector of leaked information requiring long collection times to receive an average of the leaked information, the average of the leaked information not revealing the leaked information.