美国数据加密标准 DES 采用长度为 64 位的密钥(实际密钥 56 位, 8 位用于奇偶校验),采用穷举搜索密钥,设计算机每秒钟判断一亿个密码是否正确,则要穷举所有的可能密钥需要花费的时间约为( )年
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