英国代写essay 移动通信

如今,更多的服务,如多媒体服务、数据服务、电子政务、电子商务和通信系统提供的网络服务,安全的网络和服务信息通信系统以及安全使用网络资源已成为一个紧迫的问题。同时提供高品质生活,多样化的功能也在各个方面引起安全问题。对这些问题的解决直接关系到推广新的通信系统和用户的利益,制造商和运营商。我们将采取的例子GSM、3 g和移动IP支持迈克Elgan的意见。

各种2 g技术已广泛应用于移动通信网络建设世界各地,其中基于TDMA的GSM系统是应用最广泛和最重要的网络,为3 g系统奠定了基础。GSM提供的安全机制,包括身份验证、数据隐私功能,身份保护和密码算法。通过验证用户避免未经授权的访问,它可以防止用户的身份被滥用;通过加密空中接口的传输,避免窃听用户信息通过无线通道,保护用户的隐私,采用分离和终端硬件设备(SIM卡)作为安全模块,它管理用户的信息和提高安全;通过替换用户的临时身份永久身份界面,攻击者不能跟踪GSM用户通过无线通道。然而,使用特殊的GSM窃听装置,窃听者可以获得临时移动用户的身份和位置信息计算用户的数量在一个特定时间和在一个特定的区域。通过这样做,攻击者可以获得他们需要的信息通过分析计算信息和寻求非法利润,对用户的隐私造成重大损害。

相比第一代模拟移动通信和第二代数字移动通信、第三代移动通信被广泛使用作为一个多媒体移动通信世界各地。3 g系统的特点之一是,它可以使用世界各地的人们可以与他人沟通在任何时间和任何地方。也就是说,每个用户都有一个个人通信号码。不管你想要哪个国家,人们可以通过手机联系你。与此同时,如果你在国外,你也可以联系国内用户或用户在其他国家很容易就像你在自己的国家。与GSM机制相比,3 g系统使得两个改进。身份验证基于序列号解决问题由于用户采用GSM系统不能验证网络并确保密钥生成的验证密钥协议的新鲜,以防止用户攻击时,攻击者重放身份验证数据以及现有GSM系统抵抗伪造攻击。3 g系统还提供了一个增强的机制来验证用户的身份与采用集团主要以保护安全传输用户的永久标识。然而,这项决议仍然是不够的。系统将采用永久身份认证机制当用户第一次注册服务净或服务失败获得用户的永久身份通过临时身份,不能连接到访问VLRo或不能搜索用户的身份数据。

英国代写essay 移动通信

Nowadays, with more services like multi-media service, data service, e-government, e-commerce and internet service provided by communication system, the safety of internet and service information in communication system as well as safe usage of network resource have become a pressing issue. While providing people with high quality life, diversified functions also cause safety problems in all aspects. The solution to these problems is directly related to popularization of new communication system and interests of users, manufacturers as well as operators. We will take the example of GSM, 3G and mobile IP to support Mike Elgan’s opinion.

Various 2G technologies have been widely used for building mobile communication network all over the world, among which GSM system based on TDMA is the most widely used and the most important network and lays the foundation for 3G system. Security mechanisms provided by GSM include identity authentication, data privacy function, identity protection and cipher algorithm. By authenticating users to avoid unauthorized access, it prevents user’s identity from being misused; by encrypting the transmission of air interface to avoid eavesdropping user’s information through wireless channel, it protects user’s privacy; by adopting separate and terminal hardware devices (SIM card) as safety module, it manages users’ information and enhances security; by replacing user’s temporary identity with permanent identity on the interface, attackers can not track GSM users through wireless channel. However, with special GSM eavesdropping devices, eavesdroppers can acquire temporary mobile user’s information on identity and location thus calculate the number of users at a specific time and in a specific area. By doing so, attackers can get the information they need by analyzing the calculated information and seek illegal profits, which causes great damage to user’s privacy.

Compared to the first-generation analog mobile communication and the second-generation digital mobile communication, the third-generation mobile communication is widely used all around the world as a multimedia mobile communication. One of the characteristics of 3G system is that it can be used all over the world and it is possible for people to communicate with others at any time and in any place. That is to say, each user has a personal telecommunication number. No matter which country you want to, people can contact you through cellphone. At the same time, if you are in foreign countries, you can also contact domestic user or user in other countries easily just like you are in your own country. Compared to mechanism of GSM, 3G system has made two improvements. Identity authentication based on serial number solves the problem due to users adopting GSM system can not authenticate the network and ensures the freshness of key generated by authenticated key agreement to prevent users from the attack when attackers replay authentication data as well as resists the forge attack existing in the GSM system. 3G system also provides an enhanced mechanism for authenticating user’s identity with the adoption of group key so as to protect the security while transmitting user’s permanent identity. However, this resolution is still not enough. System will adopt permanent identity authentication mechanism when users first register service net or service net fails to acquire users’ permanent identity via temporary identity and can not connect to the accessed VLRo or can not search users’ identity data.