HELLEBRANDT, Lukáš, Ivan HOMOLIAK, Kamil MALINKA and Petr HANÁČEK. Increasing Trust in Tor Node List Using Blockchain. In 2019 IEEE INTERNATIONAL CONFERENCE ON BLOCKCHAIN AND CRYPTOCURRENCY (ICBC). NEW YORK: IEEE, 2019, p. 29-32. Available from: https://dx.doi.org/10.1109/BLOC.2019.8751340.
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Basic information
Original name Increasing Trust in Tor Node List Using Blockchain
Authors HELLEBRANDT, Lukáš, Ivan HOMOLIAK, Kamil MALINKA and Petr HANÁČEK.
Edition NEW YORK, 2019 IEEE INTERNATIONAL CONFERENCE ON BLOCKCHAIN AND CRYPTOCURRENCY (ICBC), p. 29-32, 4 pp. 2019.
Publisher IEEE
Other information
Original language English
Type of outcome Proceedings paper
Confidentiality degree is not subject to a state or trade secret
Doi http://dx.doi.org/10.1109/BLOC.2019.8751340
UT WoS 000491257000012
Tags International impact, Reviewed
Changed by Changed by: RNDr. Pavel Šmerk, Ph.D., učo 3880. Changed: 29/3/2023 13:39.
Abstract
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.
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