CIRCUIT ARRANGEMENT FOR PREVENTING UNAUTHORISED ACCESS

• Main Author: HELMUT LOGEMANN
• Format: Patent
• Language: English
• Published: 28.07.1988
• Edition: 4
• Subjects: ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDEDFOR ELSEWHERE; CHECKING-DEVICES; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; GENERATING RANDOM NUMBERS; PHYSICS; REGISTERING OR INDICATING THE WORKING OF MACHINES; TIME OR ATTENDANCE REGISTERS; TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION; VOTING OR LOTTERY APPARATUS; WIRELESS COMMUNICATIONS NETWORKS

The circuit arrangement in a communication system which is protected by subscriber-specific passwords having a memory which contains all the possible passwords and a comparator which compares each received password with the memory content. A monostable delay circuit with a subsequent logic combining...