关键词: 虚拟机, x86体系结构, 加密

Abstract: Virtual machine technique is one of the hot topics in the research field of computer security. From the viewpoint of software protection, the key technologies of software protection based on virtual machine are given. In order to illustrate the specific steps and methods, an example is presented. In the design, the protection objects are defined as functions and the corresponding methods of single-function identifying are discussed. Using basic x86 codes, the virtual machine is constructed, then the basic instruction set is processed by encryption and decryption technology based on bytecode. In addition, the necessary modular expansion of instructions is given in order to increase the strength of protection. The virtual machine technique for software protection is in its infancy and growing stage. Therefore the related researches and applications based on virtual machine technique have high research value and huge developing space.

Key words: virtual machine, x86 architecture, encryption