A system for limiting access to confidential information including storage circuitry for storing the confidential information. An access enabling circuit allows access to the storage circuitry in response to a first level of an enabling signal. A processor generates the enabling signal for a predetermined amount of time in response to sensing of a change of a predetermined value that is produced in response to an act by a person responsible for the confidentiality of the confidential information. The enabling signal assumes a second level after the predetermined amount of time to block access to the storage circuitry.