Increasing Trust in Tor Node List Using Blockchain

HELLEBRANDT, Lukáš, Ivan HOMOLIAK, Kamil MALINKA a Petr HANÁČEK. Increasing Trust in Tor Node List Using Blockchain. In 2019 IEEE INTERNATIONAL CONFERENCE ON BLOCKCHAIN AND CRYPTOCURRENCY (ICBC). NEW YORK: IEEE, 2019, s. 29-32. Dostupné z: https://dx.doi.org/10.1109/BLOC.2019.8751340.

Základní údaje

• Originální název: Increasing Trust in Tor Node List Using Blockchain
• Autoři: HELLEBRANDT, Lukáš, Ivan HOMOLIAK, Kamil MALINKA a Petr HANÁČEK.
• Vydání: NEW YORK, 2019 IEEE INTERNATIONAL CONFERENCE ON BLOCKCHAIN AND CRYPTOCURRENCY (ICBC), od s. 29-32, 4 s. 2019.
• Nakladatel: IEEE

Další údaje

• Originální jazyk: angličtina
• Typ výsledku: Stať ve sborníku
• Utajení: není předmětem státního či obchodního tajemství
• Doi: http://dx.doi.org/10.1109/BLOC.2019.8751340
• UT WoS: 000491257000012
• Příznaky: Mezinárodní význam, Recenzováno

Anotace

Tor is a low-latency free anonymization network based on onion routing. In Tor, directory servers maintain a list of all nodes. It is, however, possible for a powerful adversary (e.g., law enforcement agencies) to seize or compromise enough directory servers and thus forge that list. Therefore, clients that obtained such a forged list of nodes can be effectively deanonymized. As a countermeasure, we propose to utilize a permissioned blockchain with a single voting committee that is privately "elected" by a verifiable random function (VRF). Since the blockchain provides us with integrity guarantees by design, we increase trust in the directory servers by decentralizing management of Tor nodes present in the shared list. We apply skiplist as an optimization reducing a validation overhead of newly joined nodes and clients. The proposed approach has only a small performance impact on the existing Tor infrastructure.