By Hartung. Girod
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Location update or call establishment) MAP: Send authentication triplets (IMSI) DTAP: Authentication request (RAND) Send authentication triplets ack. (RAND, SRES, Kc) DTAP: Authentication response (SRES*) SRES* = SRES? 15 Message ﬂow during the authentication of a subscriber. t Global System for Mobile Communications (GSM) 19 with the A3 algorithm and a random number to generate the authentication triplet, which contains the following values: • RAND: A 128-bit random number. 14). • Kc: The ciphering key, Kc, is also generated by using Ki and RAND.
If A had terminated the call, the messages would have been identical, with only the direction of the REL and RLC reversed. For the communication between the switching centers (SSPs) and the databases (SCPs), the Signaling Connection and Control Part (SCCP) is used on layer 4. SCCP is very similar to Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) in the IP world. Protocols on layer 4 of the protocol stack enable the distinction of different applications on a single system. TCP and UDP use ports to do this.
G. call establishment request) is sent. In the ﬁrst step of the process, the MSC requests an authentication triplet from the HLR/AuC. The AuC retrieves the Ki of the subscriber and the authentication algorithm (A3 algorithm) based on the IMSI of the subscriber that is part of the message from the MSC. 14 SRES Creation of a signed response (SRES). g. location update or call establishment) MAP: Send authentication triplets (IMSI) DTAP: Authentication request (RAND) Send authentication triplets ack.
Copyright Protection in Video Delivery Networks by Watermarking of Pre-Compressed Video by Hartung. Girod