基于Android的短信端到端加密系统的设计与实现

发布时间：2018-01-10 14:11

本文关键词：基于Android的短信端到端加密系统的设计与实现　出处：《东华理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：短信功能使用频繁,应用范围广泛,并且短信内容中含有丰富的信息。但现有短信服务系统采用存储转发模式,且设计中存在一些漏洞,使短信服务系统易遭受中间人攻击、信息泄露等安全威胁。本文根据对以上问题的研究发现,在Android开源平台基础上,设计并实现了短信端到端加密系统,以加强短信安全。通过阅读大量文献资料,对短信服务体系以及短信安全方面的研究现状具有了一定了解。结合Android源码以及API,分析出Android短信的发送流程以及短信内容的存储方法。通过对加密算法的研究,本文选择了资源消耗少、加解密时间短的对称加密算法进行相关研究。同时通过使用时间复杂度对比分析,对DES、3DES、AES三种主流对称加密算法的效率进行综合分析,最终选择较为高效的AES算法进行加解密设计。在设计过程中,本系统创新性的避免了加密解密双方需要提前商议密钥的步骤,利用短信收发双方的手机号码以及短信发送时间来产生密钥,并且对接收方可能存在的时间延迟做了容错处理。系统实现了短信发送内容AES算法加密,加密结果利用Base64算法对不可见字符进行处理。在完善短信功能方面,本系统就多联系人和短信内容长度等问题进行了相关研究,并在系统中进行了相关设计,实现了短信群发和长短信内容的发送。本文提出的Android短信端到端加密技术在维护短信安全上具有良好的实用性。通过对系统性能进行测试,系统能达到预期设想,在不干扰正常短信的情况下进行加密短信的收发。测试中还发现,经过加密及编码后短信长度增加,降低了系统传输能力,在今后的研究中应该着重于短信传输性能的提高,并且在系统界面以上加以改善。
[Abstract]:The short message function is used frequently, the application scope is wide, and the short message content contains abundant information. But the existing short message service system adopts the mode of storage and forwarding, and there are some loopholes in the design. The short message service system is vulnerable to man-in-the-middle attacks, information disclosure and other security threats. Based on the above research, this paper found that based on the Android open source platform. Designed and implemented a SMS end-to-end encryption system to enhance the security of SMS. Read a lot of literature. SMS service system and SMS security research status has a certain understanding. Combined with Android source code and API. This paper analyzes the sending flow of Android short message and the storage method of short message content. Through the research of encryption algorithm, this paper chooses less resource consumption. At the same time, the efficiency of the three main symmetric encryption algorithms is analyzed synthetically by comparing and analyzing the time complexity of the three main symmetric encryption algorithms with short encryption and decryption time. Finally, the more efficient AES algorithm is chosen for encryption and decryption design. In the process of design, this system innovatively avoids the step that encryption and decryption both sides need to negotiate the key in advance. The key is generated by using the cell phone number and the time of sending and receiving SMS, and the possible time delay of the receiver is fault-tolerant. The system implements the encryption of SMS content by AES algorithm. Encryption results use Base64 algorithm to deal with invisible characters. In order to improve the function of short message, this system has carried on the related research on the multi-contact person and the short message content length and so on. And carried on the related design in the system. The Android short message End-to-End encryption technology proposed in this paper has good practicability in maintaining SMS security. The system performance is tested. The system can achieve the expectation of sending and receiving encrypted SMS without interfering with normal SMS. The test also found that the length of SMS increased after encryption and coding, which reduced the transmission capacity of the system. In the future research, we should focus on improving the performance of short message transmission, and improve the system interface above.
【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN918.4

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