Abstract: The identification system consists of an electronic key comprising a passive memory area (10) and a shift register (9) and a lock capable of being coupled with the key. The lock is capable of supplying a pulse causing the code contained in the memory (10) to be loaded into the register (9). The register (9) is looped on itself via connection (113). Before reading the contents of the register (9) a set number of clock pulses, counted by the control circuit (149) and transmitted by the electronic lock on the H terminal, produces a series of permutations of the contents of the shift register (9). After this permutation phase, the AND gate (157) allows the data contained in the shift register (9) to flow out through the output terminal S due to the action of additional read pulses the number of which is equal to the number of bits in the register (9).

Abstract: The indentification system consists of a key comprising a passive memory area (10) and a shift register (9) and a lock which can be coupled with the key. The lock is capable of supplying a set number of pulses causing the code contained in the memory (10) to be loaded into the register (9). The register (9) is subdivided into a certain number of elements linked together but loaded independently. This loading is carried out successively by the multiplexer (111). Transmission of an incorrect number of loading pulses leads, through connection (113), to a modification of the contents of the shift register (9).

Abstract: System for identifying, for example, a person for operating an electrical appliance, a mechanical appliance or any other appliance.When the key (2) has been coupled to the electronic lock this first of all transmits, via circuit (18), a single pulse enabling the coded data originally contained in the passive memory formed by the set of switches (10) in the key to be loaded into the shift register (9). The shift register (9) is subsequently read by means of a succession of pulses transmitted by the serial reading circuit (20). The number of pulses corresponds to the number of bits in the shift register (9) owing to the existence of a read stop circuit (23) containing a pulse counter (42).In a variant some of the switches (10) can be replaced by fusible links, the state of which can be changed at will by a writing circuit contained in the electronic key.