Cryptology ePrint Archive: Report 2019/704

Arcula: A Secure Hierarchical Deterministic Wallet for Multi-asset Blockchains

Adriano Di Luzio and Danilo Francati and Giuseppe Ateniese

Abstract: This work presents Arcula, a new design for hierarchical deterministic wallets that brings identity-based addresses to the blockchain. Arcula is built on top of provably secure cryptographic primitives. It generates all its cryptographic secrets from a user-provided seed and enables the derivation of new public keys based on the identities of users, without requiring any secret information. Unlike other wallets, it achieves all these properties while being secure against privilege escalation. We formalize the security model of hierarchical deterministic wallets and prove that an attacker compromising an arbitrary number of users within an Arcula wallet cannot escalate his privileges and compromise users higher in the access hierarchy. Our design works out-of-the-box with any blockchain that enables the verification of signatures on arbitrary messages. We evaluate its usage in a real-world scenario on the Bitcoin Cash network.

Category / Keywords: applications / Hierarchical Deterministic Wallet; Hierarchical Key Assignment; Bitcoin; Blockchain

Date: received 13 Jun 2019, last revised 10 Dec 2019

Contact author: dfrancat at stevens edu, diluzio at di uniroma1 it

Available format(s): PDF | BibTeX Citation

Version: 20191210:190608 (All versions of this report)

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