[Resource Topic] 2020/676: An airdrop that preserves recipient privacy

Welcome to the resource topic for 2020/676

Title:
An airdrop that preserves recipient privacy

Authors: Riad S. Wahby, Dan Boneh, Christopher Jeffrey, Joseph Poon

Abstract:

A common approach to bootstrapping a new cryptocurrency is an airdrop, an arrangement in which existing users give away currency to entice new users to join. But current airdrops offer no recipient privacy: they leak which recipients have claimed the funds, and this information is easily linked to off-chain identities. In this work, we address this issue by defining a private airdrop and describing concrete schemes for widely-used user credentials, such as those based on ECDSA and RSA. Our private airdrop for RSA builds upon a new zero-knowledge argument of knowledge of the factorization of a committed secret integer, which may be of independent interest. We also design a private genesis airdrop that efficiently sends private airdrops to millions of users at once. Finally, we implement and evaluate. Our fastest implementation takes 40–180 ms to generate and 3.7–10 ms to verify an RSA private airdrop signature. Signatures are 1.8–3.3 kiB depending on the security parameter.

ePrint: https://eprint.iacr.org/2020/676

See all topics related to this paper.

Feel free to post resources that are related to this paper below.

Example resources include: implementations, explanation materials, talks, slides, links to previous discussions on other websites.

For more information, see the rules for Resource Topics .