Multiple-Committed Proof of Data Possession Among Multiple Co-Workers
Date Issued
2012
Date
2012
Author(s)
Chou, Fan-Gang
Abstract
Our proposed scheme is a scheme focused on Proof of Data Possession (PDP) among multiple co-workers. We will have a master who originally owns the file and a group of co-workers. Every granted co-worker can generate valid signatures and modify the Merkle Hash Tree on files he writes or modifies. We will also have a server or trusted third party to play the role of bridge between the co-workers and the master, storing the public key and identity list of owners and co-workers.
During verification phase, we should first check the signer of the tokens then retrieve the proper public keys to the verifier.
We proposed a protocol that can change normal PDP or POR into a shared PDP or a shared POR among many coworkers. The advantage of our scheme is that we can do some access control on the co-workers and keep track of any co-workers’ behavior. If someone cheats, we can undeniably know who the cheater is by examining the fragment of the modified file.
We also make some improvements on the BLS signature based PDP making it faster but still secure. Duo to our implementations and experiments, we can truly say that the additional cost of our scheme is acceptable.
Subjects
PDP
co-workers
Type
thesis
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