With the rapid development and widespread application of wireless communication technology, access to wired telephone networks through wireless interfaces has become increasingly common, and its business content is no longer limited to voice services. Various data services have begun to occupy a considerable proportion, and will eventually Develop into a multimedia business. However, just as mankind is increasingly benefiting from this worldwide communication technology revolution, attention to the security of the communication system itself has never been as important as it is today. This is partly because people are increasingly relying on communication systems to transmit private and business information, but the widespread application of wireless communication technology is also a reason. Wiretapping is the most commonly used eavesdropping method in traditional telephone systems. However, due to the broadcast nature of wireless transmission, eavesdropping on other people's conversations on a wireless interface is much simpler and more difficult to detect than in a wired environment. At the same time, the mobility of mobile users has also brought new problems, such as how to confirm whether a mobile user is legitimate and how to protect personal information related to the user's location. Clearly, the wireless interface will be a security vulnerability if appropriate measures are not taken. More importantly, this also exposes the wired part of the network to various security threats, thereby threatening the information security of the entire telecommunications system. In order to further improve the security of the telecommunications system, especially the wireless interface, many security measures have been taken, such as carefully designing the transmission scheme on the wireless channel and using cryptography technology. Although cryptographic technology does help improve system security and provide user authentication and personal information confidentiality, there are still many issues to be considered in practical applications.
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