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| Content Provider | ACM Digital Library |
|---|---|
| Author | Papamanthou, Charalampos Erway, C. Chris Küpçü, Alptekin Tamassia, Roberto |
| Copyright Year | 2015 |
| Abstract | As storage-outsourcing services and resource-sharing networks have become popular, the problem of efficiently proving the integrity of data stored at untrusted servers has received increased attention. In the Provable Data Possession (PDP) model, the client preprocesses the data and then sends them to an untrusted server for storage while keeping a small amount of meta-data. The client later asks the server to prove that the stored data have not been tampered with or deleted (without downloading the actual data). However, existing PDP schemes apply only to static (or append-only) files. We present a definitional framework and efficient constructions for Dynamic Provable Data Possession (DPDP), which extends the PDP model to support provable updates to stored data. We use a new version of authenticated dictionaries based on rank information. The price of dynamic updates is a performance change from $\textit{O}(1)$ to $\textit{O}(log$ $\textit{n}$ (or $O(n^{ε}log$ $\textit{n}))$ for a file consisting of $\textit{n}$ blocks while maintaining the same (or better, respectively) probability of misbehavior detection. Our experiments show that this slowdown is very low in practice (e.g., 415KB proof size and 30ms computational overhead for a 1GB file). We also show how to apply our DPDP scheme to outsourced file systems and version control systems (e.g., CVS). |
| Starting Page | 1 |
| Ending Page | 29 |
| Page Count | 29 |
| File Format | |
| ISSN | 10949224 |
| e-ISSN | 15577406 |
| DOI | 10.1145/2699909 |
| Volume Number | 17 |
| Issue Number | 4 |
| Journal | ACM Transactions on Information and System Security (TISSEC) |
| Language | English |
| Publisher | Association for Computing Machinery (ACM) |
| Publisher Date | 2015-04-24 |
| Publisher Place | New York |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Coud storage Cloud security Outsourced storage Proof of retrievability Provable data possession Secure storage |
| Content Type | Text |
| Resource Type | Article |
| Subject | Computer Science Safety, Risk, Reliability and Quality |
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