Patent ID: 6380843
Filing Date: 2002-04-30
Classification: G06Q,G07C,G07F

Abstract:
A system of access checking by means of a portable storage carrier (C) on which there is recorded an electronic key CL, comprising:production means (LE) for production of the electronic key; and a means fulfilling an electronic lock (L) function for authorizing access should the storage carrier contain the requisite electronic key, characterized in that the production means (LE) comprises an information element (HA) for entitlement to produce the key CL, including a public key (K), and a digital signature CER of the public key, and characterized in that a transfer of entitlement to a new production means is made by recording a new public key Kâ€² and a corresponding signature CERâ€², wherein an invalid key produced using the production means (LE) that no longer possesses entitlement is not permitted access to units protected by the means fulfilling the electronic lock (L) function.