The new algorithm can use a variable length key, and its output is 256-bit message authentication code(MAC).

新算法具有一个可变长度密钥，输出2 5 6位的报文鉴别码（MAC）。

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The combination of encryption algorithm and the key length governs the strength of the encryption type.

加密算法和密钥长度的组合决定加密类型的强度。

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After a simple check to ensure the two passwords are of equal length, each key is then matched in the entire password - ensuring that the fifth character is a zero in both passwords, for example.

在经过简单的检查确保两个密码长度相等之后，将在整个密码中匹配各个键——例如，确保两个密码中的第五个字符是零。

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Because if you did what I suggested with the list, the time to look up the key would be linear in the length of the list. You'd have to look at each element until you found the key.

字典是用一种很神奇的，叫做散列法的算法,来实现的，后面我们将,会学到一点关于。

麻省理工公开课 - 计算机科学及编程导论课程节选

Before the new regulations, companies were forced to obtain a license from the U.S. government to export encryption products higher than 56 bits in key length.

CNN: Survey finds encryption rules loosening worldwide

Mr Letts says they discussed all their key decisions at length with Iraqi officials and then took a democratic vote among themselves.

BBC: What happened to Iraq's 'human shields'?

At 4in long, they are over double the length of the average Yale lock key.

BBC: Disabled toilets: What is a Radar key?