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这个校验和的基本规则是前九位数的每一位乘上它的位置(即第一位数乘上1，第二位数乘上2，依次类推)。
The basic rule for this checksum is that each of the first nine digits is multiplied by its position (that is, the first digit times one, the second digit times two, and so on).
同时用变位置的CRC校验算法来判别文件是否被修改并实现对被修改文件的自我恢复。
Further more Depending on CRC check in unfixed position, PE file judes and recover itself if modified.
所述设备包括：接收模块、第一回溯模块、校验模块、分叉位置获得模块和第二回溯模块。
The device comprises a receiving module, a first backtracking module, a verification module, a bifurcation position acquisition module and a second backtracking module.
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