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中文摘要：
摘要：结合对称密码算法中的DES、IDEA、AES和单向散列算法中的MD5、SHA-1、SHA-256等算法，提出了一种在同一文件内部采用多模式加密的方案，该方案比传统的单一模式加密的方案能更好地保证数据的完整性和安全性。详细描述了该方案的算法实现，通过试验验证了其实用性，同时分析了该方案的优点和不足。
英文摘要：
This paper presented a solution to the file encryption which use symmetric encryption methods such as DES, IDEA, AES and hash algorithms such as MD5, SHA-1, SHA- 256. Many encryptions can be used to encrypt a file in the solution. Files encrypted by this solution are more secure than those traditional ones. An implement method based this solution was given, its practicability is proofed by experiments. At last this paper discussed some strongpoints and shortages about this solution.
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