Next I create a Cipher class object and initiate it in encryption mode.

接着创建cipher类对象，并以加密方式对它初始化。

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A Cipher class object is created and initiated in the decryption mode.

这样就用解密方式创建并初始化了cipher类对象。

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I then re-initialize the cipher with the new iv object.

然后我用新的iv对象重新初始化这个密码。

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