SECURITY SYSTEM AND METHOD FOR REMOTE TERMINAL NETWORK

摘要

In a security system, each user of the system is provided with a personal terminal (11), coupled via a transmission means (15) to a central processor (13). In use, the user keys in a personal identification number (PIN) which is utilized in an algorithm together with a terminal number to calculate a PIN residue which is compared with a stored PIN residue at the terminal (11). In the event of a successful comparision, a request signal in accordance with input information and including a file number is transmitted to the central processor (13), where the file number is utilized in addressing a memory (47) to retrieve a stored terminal number and algorithm. The terminal number and a generated random number are utilized by the central processor (13) to calculate a processor residue. The random number is also transmitted to the terminal (11) where the same algorithm is effected to provide a terminal residue, which is transmitted to the central processor (13) for comparision with the processor residue. A successful comparision enables access to the desired centrally stored file to be obtained.