目录
1 需求分析 .................................................................................................1
2 总体设计 .................................................................................................2
3 详细设计 .................................................................................................3
3.1 换位加密流程图 ............................................................................3
3.2 换位解密流程图 ............................................................................3
3.3 替代加密流程图 ............................................................................3
3.4 替代解密流程图 ............................................................................3
4 调试与测试 .............................................................................................4
5 测试结果 .................................................................................................5
6 附录 .........................................................................................................6
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