Method for providing a program module in a communications system
First Claim
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1. A method for providing a program module in a communications system, comprising:
- making the program module available from a server,transmitting the program module to a subscriber,calculating a checking criterion every time the program module is transmitted, the checking criterion being separately calculated in a security device and at the subscriber, the checking criterion being calculated based on the contents of the program module and based on an individual key associated with the subscriber, andcomparing the checking criterion calculated in the security device with the checking criterion calculated at the subscriber in order to determine whether errors are contained in the program module received by the subscriber.
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Abstract
A method provides a program module in a communications system. The program module is accommodated by a server, the program module is transmitted to a subscriber terminal, a test criterion is calculated each time inside a security device and in the subscriber terminal by using the program module and an individual key. By comparing the test criterion, it is determined whether the program module has been defectively received by the subscriber terminal.
31 Citations
21 Claims
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1. A method for providing a program module in a communications system, comprising:
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making the program module available from a server, transmitting the program module to a subscriber, calculating a checking criterion every time the program module is transmitted, the checking criterion being separately calculated in a security device and at the subscriber, the checking criterion being calculated based on the contents of the program module and based on an individual key associated with the subscriber, and comparing the checking criterion calculated in the security device with the checking criterion calculated at the subscriber in order to determine whether errors are contained in the program module received by the subscriber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A communications system, comprising:
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a server to hold a program module; a transmitter to transmit the program module from the server to a subscriber; a calculation unit provided at the subscriber to calculate a checksum criterion based on the program module received from the server and based on a key specific to the subscriber; a security device to calculate a checksum criterion based on the program module transmitted to the subscriber and based on a key specific to the subscriber; and a central device to compare the checking criteria to determine whether the program module was received with errors.
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21. A method for providing a program module in a communications system, comprising:
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making the program module available from a server, transmitting the program module to a subscriber, calculating a checking criterion every time the program module is transmitted, the checking criterion being separately calculated in a security device and at the subscriber, the checking criterion being calculated based on the contents of the program module and based on an individual key associated with the subscriber, and comparing the checking criterion calculated in the security device with the checking criterion calculated at the subscriber in order to determine whether errors are contained in the program module received by the subscriber wherein the checking criterion is independently calculated in the security device and at the subscriber, the checking criterion is calculated in the security device and at the subscriber using calculations that are substantially the same, and the subscriber uses wireless transmission to transmit the checking criterion to a central device where the checking criteria are compared.
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Specification