These are a little more difficult to prevent,
but again not impossible.
Some of those processes require strict routing in the network (rather than loose routing
as often implemented in VoIP), as well as encryption. Most operators shy away from
these methods because of the complexity it adds to the network. However, when one
considers the added security, one must weigh the cost of losing revenues and degradation
of services vs. network complexity.
Security Procedures in the IMS 151
Wireless certainly brings about many of these concerns, as well as a few that wireline
operators do not have to worry about. There is a lot of concern over the air interface
within a wireless network, especially with WiFi and WiMAX technologies. Devices exist
today that make eavesdropping over the air interface much simpler, and therefore
wireless operators are looking into various ways to encrypt and secure the air interface
to prevent unauthorized eavesdropping.
The GSM and CDMA operators have already implemented encryption over the air interface
for exactly this reason. This has resulted in a sharp decline in handset cloning,
where hackers would ???eavesdrop??? on the air interface trying to capture the IMEI and
IMSI of a device, and then copying that data for use in their own devices. Encryption
can have the same results internal to the network as well, if implemented properly.
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