Verfahren und Einrichtung zur Teilnehmergruppierung in einem Mobil-Kommunikationsnetz

摘要

The method involves encrypting and decrypting the transmitted data by the device of encryption algorithms, in which a derivative of the encryption algorithm is formed and is associated with a determined group of subscribers. The derivatives (A5X) are preferably formed from the encryption algorithms (A51 or A52), by preferably re-programming at least one polynom used in one feed-back shift register, used for the implementation of the encryption algorithm. The polynom is preferably re-programmed by changing at least one element of the polynom.