A Tale of Two Trees: One Writes, and Other Reads
| Autor: | Byoungyoung Lee, Duc Viet Le, Adil Ahmad, Lizzy Tengana Hurtado, Mohsen Minaei, Aniket Kate |
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| Rok vydání: | 2020 |
| Předmět: |
World Wide Web
021110 strategic defence & security studies 0303 health sciences 03 medical and health sciences Computer science business.industry 0211 other engineering and technologies General Earth and Planetary Sciences Information technology 02 engineering and technology business 030304 developmental biology General Environmental Science |
| Zdroj: | Proceedings on Privacy Enhancing Technologies. 2020:519-536 |
| ISSN: | 2299-0984 |
| DOI: | 10.2478/popets-2020-0039 |
| Popis: | The Bitcoin network has offered a new way of securely performing financial transactions over the insecure network. Nevertheless, this ability comes with the cost of storing a large (distributed) ledger, which has become unsuitable for personal devices of any kind. Although the simplified payment verification (SPV) clients can address this storage issue, a Bitcoin SPV client has to rely on other Bitcoin nodes to obtain its transaction history and the current approaches offer no privacy guarantees to the SPV clients. This work presents T 3, a trusted hardware-secured Bitcoin full client that supports efficient oblivious search/update for Bitcoin SPV clients without sacrificing the privacy of the clients. In this design, we leverage the trusted execution and attestation capabilities of a trusted execution environment (TEE) and the ability to hide access patterns of oblivious random access machine (ORAM) to protect SPV clients’ requests from potentially malicious nodes. The key novelty of T 3 lies in the optimizations introduced to conventional ORAM, tailored for expected SPV client usages. In particular, by making a natural assumption about the access patterns of SPV clients, we are able to propose a two-tree ORAM construction that overcomes the concurrency limitation associated with traditional ORAMs. We have implemented and tested our system using the current Bitcoin Unspent Transaction Output (UTXO) Set. Our experiment shows that T 3 is feasible to be deployed in practice while providing strong privacy and security guarantees to Bitcoin SPV clients. |
| Databáze: | OpenAIRE |
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