Method and apparatus for supervising access and protecting against unauthorized access in a communication metwork
First Claim
1. A method for supervising access and protecting against unauthorized access in message networks whereby information in the form of messages is transmitted over a network having a plurality of stations and a central supervision device configured to receive each of the messages transmitted on the network and a particular portion of the information contained in the message is employed for supervising the right-of-access at the message receiver, said method comprising the steps of:
- generating, at a first station, a message destined for a second station, said first station message including signals indicating a right of access of said first station with other stations in the network;
transmitting said first station message over the network;
intercepting said transmitted first station message at said central supervision device;
comparing said transmitted first station message right of access signals with supervisory signals stored in a table in said central supervision device indicative of authorized access to said second station;
generating cancellation signals if said comparison indicates that access to said second station is unauthorized;
transmitting said cancellation signals to said second station;
halting execution of said transmitted first station message by said second station upon receipt of said cancellation signals; and
beginning the comparison of the right-of-access by means of the central supervision device (SV) during the transmission of a message and terminating said comparison before the end of the message, and in the case of an unauthorized access the central supervision device (SV) editing a portion of said transmitted message to guarantee its non-effectiveness.
0 Assignments
0 Petitions
Accused Products
Abstract
With this method protection against unauthorized access can be accomplished centrally so that less memory capacity and calculation time are needed for testing the right-of-access. By this the message traffic in the whole network is constantly intercepted by a central supervision device (SV). A table is stored in the central supervision device (SV) whereby upon entry of a message, the central supervision device tests the right-of-access of the message sender (SE,PC) to the message receiver (AK) with the aid of data in the table and a predetermined portion of the information contained in the message. In case of unauthorized access, the supervision device causes the message to be rendered ineffective.
18 Citations
10 Claims
-
1. A method for supervising access and protecting against unauthorized access in message networks whereby information in the form of messages is transmitted over a network having a plurality of stations and a central supervision device configured to receive each of the messages transmitted on the network and a particular portion of the information contained in the message is employed for supervising the right-of-access at the message receiver, said method comprising the steps of:
-
generating, at a first station, a message destined for a second station, said first station message including signals indicating a right of access of said first station with other stations in the network; transmitting said first station message over the network; intercepting said transmitted first station message at said central supervision device; comparing said transmitted first station message right of access signals with supervisory signals stored in a table in said central supervision device indicative of authorized access to said second station; generating cancellation signals if said comparison indicates that access to said second station is unauthorized; transmitting said cancellation signals to said second station; halting execution of said transmitted first station message by said second station upon receipt of said cancellation signals; and beginning the comparison of the right-of-access by means of the central supervision device (SV) during the transmission of a message and terminating said comparison before the end of the message, and in the case of an unauthorized access the central supervision device (SV) editing a portion of said transmitted message to guarantee its non-effectiveness. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
Specification