覆盖技术在程序加密中的应用

本文对覆盖技术作了详细的介绍，利用覆盖技术加密是计算机中程序密文的方法之一，特别是在程序的抗分析上，覆盖技术更是有其独到之处。由于覆盖技术要用到一些ＤＯＳ的特殊中断，而且在处理及控制一些程序段时有一定的难度，为此本文结合实例给出了完整的覆盖程序，并对其中的每一步过程作了具体说明。通过了解覆盖程序的执行过程，可以掌握它的基本要领，对设计不同要求的应用程序有一定的帮助。

APPLYING AN OVERLAY TECHNIQUE IN THE ENCTPHERMENT OF PROGRAMS

This paper introduces the overlay technique in detail. It is one of the security methods about computer information, especially on antianalysis. To process and control some programs with overlay technique , there are some difficulties because of some conditions. In this paper, a complete program with some examples is presented,as understanding the programs,you may grasp the essentials of this technique,and then will improve your ability of designing programs.