Abstract

Disclosed is an electronic locking device including electrically interacting key part and lock part each including electronic data processor with an inner code which is particular for a pair of key and lock units which belong one to another. To increase the number of variations and to inhibit the breaking of the code, the latter is generated in two stages whereby the input magnitudes for the code are retrieved from a collection of random numbers randomly generated in each unit. In the first stage of the coding process, the input magnitudes are subjected to computation according to a definite algorithm. In the second stage, only a fragment of the computation result is used and arranged according to a definite rule or formula to serve as output magnitudes for a comparator where the final arrangement of the fragments formed in respective units is tested as to mutual agreement. In the case of an agreement, a switching pulse is generated which activates bolt control mechanism in the locking unit.