DEVICE AND METHOD FOR SYNCHRONISING VOLTAGE CIPHERING MACHINE IN ATM NETWORKS

摘要

The invention relates to a device and a method for synchronising at least on e voltage deciphering machine which on the receiver side is connected to a transmission channel for ATM cells. A voltage ciphering machine is mounted i n the transmission channel at transmitter level. The voltage ciphering machine and the voltage deciphering machine are both provided with a pseudo-random generator which produces a variable key which is identical at transmitter an d receiver level with the aid of a secret key. A device for cell boundary detection and a state automaton are respectively associated with the voltage ciphering machine and the at least one voltage deciphering machine. The stat e automaton can be switched from the device for cell boundary detection and th e respective state can be used along with the secret key in order to produce a variable key.