The paper gives some practical methods of encryption and decryption as well as preventive trace, including hard disk encryption, floppy disk encryption, disk file encryption and protection.

给出了一些较常用的加密解密方法及反跟踪技术，内容包括硬盘加密、软盘加密以及磁盘软件加密与保护技术。

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Finally a software encryption and decryption method of PE file is put forward.

最后提出了用软件对PE可执行文件的加密解密方法。

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