Use the ID file handle in the NSFNoteCopyAndEncryptExt2 method to encrypt the document.

在 NSFNoteCopyAndEncryptExt2 方法中使用取到的 ID 文件句柄，用以对文档加密。

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A CipherService is what most developers want when securing data: a simple, stateless, thread-safe API that can encrypt or decrypt data in its entirety in one method call.

CipherService是多数开发者在保护数据时梦寐以求的东西：简单、无状态、线程安全的API，能够在一次方法调用中对整个数据进行加密或解密。

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You pass this method the KFM credential handle so that you can properly encrypt a message.

将KF M凭证的句柄传递给这个方法，就可以正确地对消息进行加密。

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