最终，它会对加密的数据和索引进行编码，编码的方式使得之后数据校验器能够使用存储证据来验证数据的完整性。
Finally, it encodes the encrypted data and index in such a way that the data verifier can later verify their integrity using a proof of storage.
此消息的完整性通过一个校验和来保护，该校验和使用客户端与身份验证服务器之间的会话密钥进行加密。
This message's integrity is protected via an encrypted checksum using the session key between the client and authentication service.
为了防止人们在该文件写入内容，苹果用校验和散列（checksum hash）函数对其进了加密。
To prevent people from writing to this file, Apple protects it with a checksum hash which has to be reverse-engineered.
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