Reactive Key-Loss Protection in Blockchains

Trusted Smart Contracts Workshop at Financial Cryptography (FC)


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).

Related Publications

All Publications

PLDI - June 16, 2021

Porcupine: A Synthesizing Compiler for Vectorized Homomorphic Encryption

Meghan Cowan, Deeksha Dangwal, Armin Alaghi, Caroline Trippel, Vincent T. Lee, Brandon Reagen

HPCA - May 1, 2021

Cheetah: Optimizing and Accelerating Homomorphic Encryption for Private Inference

Brandon Reagen, Wooseok Choi, Yeongil Ko, Vincent T. Lee, Hsien-Hsin S. Lee, Gu-Yeon Wei, David Brooks

Information and Inference: a Journal of the IMA - January 18, 2021

Secure multiparty computations in floating-point arithmetic

Chuan Guo, Awni Hannun, Brian Knott, Laurens van der Maaten, Mark Tygert, Ruiyu Zhu

VLDB - July 31, 2021

CALYPSO: Private Data Management for Decentralized Ledgers

Eleftherios Kokoris-Kogias, Enis Ceyhun Alp, Linus Gasser, Philipp Jovanovic, Ewa Syta, Bryan Ford

To help personalize content, tailor and measure ads, and provide a safer experience, we use cookies. By clicking or navigating the site, you agree to allow our collection of information on and off Facebook through cookies. Learn more, including about available controls: Cookies Policy