当她需要下载一些文档的时候，Alice会使用TG来生成一个令牌和一个解密的密钥。

When she wants to download some documents, Alice USES the TG to generate a token and a decryption key.

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之前的步骤生成用于生成ltpa令牌的密钥和密码。

The previous step generates cryptographic keys and a password used in LTPA token generation.

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协作是通过Alice生成新的令牌还有解密密钥完成的，密钥会被传送给Bob，他会使用密钥从云中取得文档并对其进行解密。

Collaboration is done by Alice generating a new token plus a decryption key which are sent to Bob who USES them to retrieve documents from the cloud and to decrypt them.

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