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abc123xyz | 11 years ago

whats to stop the node replying with the hash of the file saying "yes the file is here" when in reality no file is there

discuss

ZitchDog|11 years ago

Haven't read the paper, but could you ask for a hash of a random offset+byte count of the file?

wyager|11 years ago

That only works on direct person-to-person systems, not decentralized systems where the entire network has to reach consensus.

slipstream-|11 years ago

Exactly what I was thinking.

_prometheus|11 years ago

the proof-of-retrievability. see http://cseweb.ucsd.edu/~hovav/dist/verstore.pdf

philsnow|11 years ago

I'm at work and don't want to read either of the papers at the moment, but if A asks B to provide proof of having stored some bytes, could B proxy that request to C and replay the reply to A ?

padelt|11 years ago

FWIW: For the simpler case of two single entities there is a non-probabilistic (whole data needed for proof) proof-of-retrievability concept: https://www.researchgate.net/publication/4326385_Reliable_Ev... Disclaimer: I am one of the authors.