Elliptic Curve Pairing Stealth Address Protocols

TL;DR

This paper introduces four elliptic curve pairing-based stealth address protocols for blockchain privacy, demonstrating improved performance over existing methods and exploring a novel single-key approach with theoretical significance.

Contribution

The paper presents four new pairing-based stealth address protocols, including a dual-key and a single-key scheme, with the dual-key protocols outperforming previous solutions.

Findings

ECPDKSAPs outperform DKSAP with view tags

Protocol 3 is Ethereum-friendly and achieves best results

ECPSKSAP offers a single-key solution with theoretical interest

Abstract

Protecting the privacy of blockchain transactions is extremely important for users. Stealth address protocols (SAP) allow users to receive assets via stealth addresses that they do not associate with their stealth meta-addresses. SAP can be generated using different cryptographic approaches. DKSAP uses an elliptic curve multiplication and hashing of the resulting shared secret. Another approach is to use a elliptic curve pairing. This paper presents four SA protocols that use elliptic curve pairing as a cryptographic solution. ECPDKSAPs are pairing-based protocols that include viewing key and spending key, while ECPSKSAP is a pairing-based protocol that uses a single key with which spending and the viewing key are derived. We find that ECPDKSAPs give significantly better results than DKSAP with the view tag. The best results are achieved with Protocol 3 (Elliptic Curve Pairing Dual Key Stealth Address Protocol), which is Ethereum-friendly. ECPSKSAP is significantly slower, but it provides an interesting theoretical result as it uses only one private key.