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[Imported from Trac: page FileId, version 2]

warner 2007-04-26 22:39:43 +00:00
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FileId.md

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The "file id" is a tagged hash of the plaintext of the file to be uploaded. It is used as the final end-to-end integrity check of the user's data, use to detect any problems in the entire processing chain: corrupted shares, broken erasure coding, the wrong decryption key. The "file id" is a [TaggedHash](TaggedHash) of the plaintext of the file to be uploaded. It is used as the final end-to-end integrity check of the user's data, use to detect any problems in the entire processing chain: corrupted shares, broken erasure coding, the wrong decryption key.
Because it is a hash of the entire file, download-time verification cannot be completed until the entire file has been retrieved. For large files that are being streamed, this only provides an after-the-fact check: "sorry, but the data that you just finished downloading and viewing was corrupted". Because it is a hash of the entire file, download-time verification cannot be completed until the entire file has been retrieved. For large files that are being streamed, this only provides an after-the-fact check: "sorry, but the data that you just finished downloading and viewing was corrupted".