Step 4: Create an Encryptor object with a data encryption key, a key encryption key, their associated algorithms, and key information to be included in the output.

步骤 4：利用一个数据加密密钥、一个密钥加密密钥、与这两个密钥相关联的算法、以及将来包含在输出信息中的密钥信息，根据它们来创建一个 Encryptor 对象。

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The key used for the data encryption could be the same key passed in the original request or another randomly generated key, the latter being more typical.

用于数字加密的密钥可能是在最初请求中传送的同一密钥，也可能是另一个随机生成的密钥，而后者更具代表性。

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Another popular secret-key cryptosystem is the International Data Encryption Algorithm (IDEA).

另一个流行的秘密密钥加密系统是国际数据加密算法(IDEA)。

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In addition 128 bit AES encryption provides data protection and in particular can be used to rapidly erase the encryption key so the drive can be repurposed without concern about the old data being accessible.

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Since your bits may travel through an upstairs apartment or the house next door, HomePlug uses a networkwide password as an encryption key to keep your data invisible to neighbors' prying eyes.

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Many factors are at play here dealing with individual or third-party data retention policies sometimes beyond your control as well as continued usage of the same private encryption key and password.

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