To authenticate MS, the MSC needs to send SRES to MS for verification. (True or False)...

To authenticate MS, the MSC needs to send SRES to MS for verification. (True or False)

When HLR crashes for some reason, GSM allows VLR to be the fall back so MS can still be authenticated.(True or False)

GSM allows important authentication where mobile equipment verifies the validity of network to avoid phishing attacks.(True or False)

Expert Solution

1. To authenticate MS, the MSC needs to send SRES to MS for verification - True [ Explanation - The 32-bit Signed Response (SRES) is sent to the MS when authentication is requested.]

2. When HLR crashes for some reason, GSM allows VLR to be the fall back so MS can still be authenticated - False

[ Explanation - When a user initiates a call, the switching equipment determines whether or not the call is coming from the device's home area. If the user is out of the home area, the area VLR sends out a request for information required to process the call. An MSC queries the HLR identified by the call for information, which it relays to the appropriate MSC, which in turn relays it to the VLR. The VLR sends routing information back to the MSC which allows it to find the station where the call originated, and, finally, the mobile device to connect. In case HLR is crahed, MS cannot be authenticated.]

3. GSM allows important authentication where mobile equipment verifies the validity of network to avoid phishing attacks - FALSE [ Explanation - GSM uses network to identify the the valid mobile equipments on a network. GSM uses the IMEI number to identify valid devices and can stop a stolen phone from accessing the network.]

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