They should also consider two-part authentication, which can combine passwords with a security key with a changing code.

他们还应该考虑双重认证，用不断变化的代码将口令与安全键码结合起来。

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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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