计算机接口加密系统的设计与开发

发布时间：2018-03-05 22:25

本文选题：信息安全　切入点：接口加密　出处：《电子科技大学》2013年硕士论文　论文类型：学位论文

【摘要】：计算机技术的普及,使信息成为当今社会的重要资源,从而决定了计算机信息安全问题有着重大的现实意义及深远的历史意义。计算机的广泛使用带来了移动存储载体的广泛应用,大量的敏感数据被存储于移动载体上,而由此带来的对移动存储载体上数据安全的要求也日益强烈。基于此,本文设计并实现了一款基于USB协议的计算机接口加密系统,通过USB接口与计算机连接,系统很好地满足了在普遍使用的优盘上实现敏感数据的加密的需求。首先,采用PROTEL 99进行硬件电路的设计,系统硬件主要使用STC11F32XE单片机作为处理核心,飞利浦公司的PDIUSBD12作为上行传输控制芯片,CH375作为下行传输控制芯片,采用SD卡进行密钥管理。软件设计上,通过keil进行控制程序的编写,软件设计主要包括DES算法进行数据加密,硬件驱动Mass-Stroage协议的处理,SPI总线的方式读写SD存储的密钥数据,对加密文件的隐藏,对U盘各散区数据的读写,实现USB固件程序的编写等几个部分。系统完成了硬件电路的印制、安装与调试,在此基础上,将编写的控制程序烧写到处理器上,进行了系统的功能验证和性能检测。通过科学的方法,对系统稳定性、传输速度和功能等各项指标进行测试,得出系统很好地满足了设计要求,各项功能指标均达到预期设计。同时,系统较好地实现了外观小型、使用简单、适用范围广、加密强度大的设计要求。在此基础上,对系统的进一步发展和改进做出了预想。随着用户对移动存储载体中敏感数据的安全需求越来越高,相信计算机接口加密系统将拥有较为广阔的市场。
[Abstract]:With the popularization of computer technology, information has become an important resource in today's society. Therefore, the problem of computer information security is of great practical significance and profound historical significance. The extensive use of computers has brought about the widespread application of mobile storage carriers, and a large number of sensitive data are stored on mobile carriers. Therefore, the demand for data security on mobile storage carrier is increasingly strong. Based on this, this paper designs and implements a computer interface encryption system based on USB protocol, which connects with computer through USB interface. The system can meet the need of encrypting sensitive data on the universal USB disk. Firstly, the hardware circuit is designed with PROTEL 99. The hardware of the system mainly uses STC11F32XE single chip microcomputer as the processing core. Philips' PDIUSBD12 is used as uplink transmission control chip and CH375 as downlink transmission control chip. SD card is used for key management. In software design, the control program is compiled through keil. The software design mainly includes DES algorithm for data encryption. The processing of Mass-Stroage protocol is driven by hardware to read and write the key data stored in SD, to hide the encrypted file, to read and write the data of each scattered area of U disk, and to write the USB firmware program. The system completes the printing of the hardware circuit. On the basis of the installation and debugging, the control program is burned to the processor, and the system function verification and performance test are carried out. Through scientific methods, the system stability, transmission speed and function are tested. It is concluded that the system meets the design requirements very well, and all the functional indexes reach the expected design. At the same time, the system achieves the design requirements of small appearance, simple use, wide application range and large encryption intensity. The further development and improvement of the system are forecasted. With the increasing demand for the security of sensitive data in the mobile storage carrier, it is believed that the computer interface encryption system will have a broad market.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TP334.7;TP309.7

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