Blackshear, Sam; Chalkias, Konstantinos; Chatzigiannis, Panagiotis; Faizullabhoy, Riyaz; Khaburzaniya, Irakliy; Kokoris Kogias, LefterisIST Austria; Lind, Joshua; Wong, David; Zakian, Tim
We present a novel approach for blockchain asset owners to reclaim their funds in case of accidental private-key loss or transfer to a mistyped address. Our solution can be deployed upon failure or absence of proactively implemented backup mechanisms, such as secret sharing and cold storage. The main advantages against previous proposals is it does not require any prior action from users and works with both single-key and multi-sig accounts. We achieve this by a 3-phase Commit()→Reveal()→Claim()−or−Challenge() smart contract that enables accessing funds of addresses for which the spending key is not available. We provide an analysis of the threat and incentive models and formalize the concept of reactive KEy-Loss Protection (KELP).
FC 2021 Workshops
The authors would like to thank all anonymous reviewers of FC21 WTSC workshop for comments and suggestions that greatly improved the quality of this paper.
FC: International Conference on Financial Cryptography and Data Security
2021-03-01 – 2021-03-05
Blackshear S, Chalkias K, Chatzigiannis P, et al. Reactive key-loss protection in blockchains. In: FC 2021 Workshops. Vol 12676. Springer Nature; 2021:431-450. doi:10.1007/978-3-662-63958-0_34
Blackshear, S., Chalkias, K., Chatzigiannis, P., Faizullabhoy, R., Khaburzaniya, I., Kokoris Kogias, E., … Zakian, T. (2021). Reactive key-loss protection in blockchains. In FC 2021 Workshops (Vol. 12676, pp. 431–450). Virtual: Springer Nature. https://doi.org/10.1007/978-3-662-63958-0_34
Blackshear, Sam, Konstantinos Chalkias, Panagiotis Chatzigiannis, Riyaz Faizullabhoy, Irakliy Khaburzaniya, Eleftherios Kokoris Kogias, Joshua Lind, David Wong, and Tim Zakian. “Reactive Key-Loss Protection in Blockchains.” In FC 2021 Workshops, 12676:431–50. Springer Nature, 2021. https://doi.org/10.1007/978-3-662-63958-0_34.
S. Blackshear et al., “Reactive key-loss protection in blockchains,” in FC 2021 Workshops, Virtual, 2021, vol. 12676, pp. 431–450.
Blackshear S, Chalkias K, Chatzigiannis P, Faizullabhoy R, Khaburzaniya I, Kokoris Kogias E, Lind J, Wong D, Zakian T. 2021. Reactive key-loss protection in blockchains. FC 2021 Workshops. FC: International Conference on Financial Cryptography and Data Security, LNCS, vol. 12676, 431–450.
Blackshear, Sam, et al. “Reactive Key-Loss Protection in Blockchains.” FC 2021 Workshops, vol. 12676, Springer Nature, 2021, pp. 431–50, doi:10.1007/978-3-662-63958-0_34.
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