Patent ES-8605070-A1 (ES)
Title: Electronic locking device with key and lock parts interacting by means of electric pulses.
IPC: G07F7/08
Filed: 1983-07-08
Abstract: The lock system, for e.g. a door, generates a random number when a start pulses is received triggered either by the key or by the lock. The number is sent to the key and both key and lock execute the same arithmetic operation using the same random number. Only a given part of the result of the arithmetic operation is sent to the lock and is there compared with the same part of the result produced by the arithmetic operation in the lock. - Only when the two compared parts agree is a pulse generated that will open the lock. Several random numbers may be generated at the lock (or key) and sent to the key (or lock) for storing prior to incorporating in the arithmetic operation. The advantage lies in a large number of possible variations with keys difficult to copy.  (0/3) EPAB- EP--98437 B An electronic locking arrangement having key- and lock-type parts interacting via electric pulses, wherein the lock part is provided on an element to be locked, such as a door, has arresting means can be operated only by a specific associated key part thereby switching over the arresting means between an operative and an inoperative position, wherein, following a start pulse, at  one part generates random numbers in form of electric pulses in a random number generator and stores the same on the one hand, while on the other hand transmitting the same to the other part via a contact medium, the pulses obtained on the key and lock sides are applied to a common comparator in the one part where they are compared, and the comparator, only in case of compliance of both pulse sequences supplies a switching pulse via a switching member for switching over the arresting means characterised in that the start pulse originates from the key part, that the random numbers are respectively separately in the key and lock parts to a two-stage encoding which is respectively characteristic of associated key and lock parts, wherein, in the first stage a computer in both parts (10,20) performs specific arithmetic operations with a given algorithm, whose arithmetic results (y,y1,y2) is dependent on the respective used random numbers ( x; x1,x2), and, in the second stage (H,H1,H2) the computer in both parts (10,20) withdraws a respective fraction (y bar,y1bar, y2bar) from the arithmetic  (ybar, y1bar, y2bar) according to a specific rule independent of the generated random numbers, and that only these result fractions (ybar, y1bar, y2bar) are transmitted between the key and lock parts and are supplied to the common comparator. - EP--98437 B An electronic locking arrangement having key- and lock-type parts interacting via electric pulses, wherein the lock part is provided on an element to be locked, such as a door, has arresting means can be operated only by a specific associated key part thereby switching over the arresting means between an operative and an inoperative position, wherein, following a start pulse, at one part generates random numbers in form of electric pulses in a random number generator and stores the same on the one hand, while on the other hand transmitting the same to the other part via a contact medium, the pulses obtained on the key and lock sides are applied to a common comparator in the one part where they are compared, and the comparator, only in case of compliance of both pulse sequences supplies a switching pulse via a switching member for switching over the arresting means characterised in that the start pulse originates from the key part, that the random numbers are respectively separately in the key and lock parts to a two-stage encoding which is respectively characteristic of associated key and lock parts, wherein, in the first stage a computer in both parts (10,20) performs specific arithmetic operations with a given algorithm, whose arithmetic results (y,y1,y2) is dependent on the respective used random numbers ( x; x1,x2), and, in the second stage (H,H1,H2) the computer in both parts (10,20) withdraws a respective fraction (y bar,y1bar, y2bar) from the arithmetic (ybar, y1bar, y2bar) according to a specific rule independent of the generated random numbers, and that only these result fractions (ybar, y1bar, y2bar) are transmitted between the key and lock parts and are supplied to the common comparator. (14pp) USAB- US4509093 A An electrically interacting key part and lock part each include 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 in that the input magnitudes for the code are retrieved from a collection of random numbers radnomly 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.