| 摘要 |
A system and method receives a request for a file containing an identifier of the requested file and a message digest, containing an expected hash result of the requested file. The system and method identifies whether it has already stored a file having that identifier and a hash result matching the message digest. If so, the file is provided, optionally after being checked for authenticity via rehashing and comparing again to the message digest. If the file is not stored in the cache, it may be retrieved from a location included in the identifier, hashed and compared to the message digest to authenticate it, and provided to the requesting program if the hash result matches the message digest.
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