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初始置换 IP(initial permutation)
子密钥生成:根据给定的 64 位密钥 K,生成 16 个 48 位的子密钥 K1 - K16,供 Feistel 轮函数调用 Feistel 轮函数:产生 32 位输出,用于在每次迭代中产生下一个 R(64 位的右半部分) 交换置换 W:迭代时要将 64 位分割成左半部分 L 和右半部分 R,迭代结束时顺便进行 ...
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