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凯撒密码Caesar cipher，是最简单的一种信息加密方法，就是把组成信息的所有字母都在字母表上按照一个固定数目进行移动。例如bee向后移动3位就变成了ehh，bee就是需要保护和被加密的信息，ehh就是加密后的、别人看不懂的信息。要破解凯撒密码就需要......
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