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                ### 對稱加密算法 在對稱加密算法中,加密和解密使用的是同一把鑰匙,即:使用相同的密匙對同一密碼進行加密和解密; 加密過程如下: 加密:原文 + 密匙 = 密文 解密:密文 - 密匙 = 原文 ![](https://img.kancloud.cn/cd/13/cd13389943cc40305a99f7303ee91746_554x242.png) 對稱加密算法有兩種類型,分別是塊密碼算法(block ciphers)和流密碼算法(stream ciphers) 塊密碼算法: ![](https://img.kancloud.cn/63/1d/631dc4053f9c476da3827f8d58b5f729_1428x508.png) 對稱加密: 優點:算法簡單,加密解密容易,效率高,執行快。 缺點:相對來說不算特別安全,只有一把鑰匙,密文如果被攔截,且密鑰也被劫持,那么,信息很容易被破譯
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