Resilient Key Generation and Digital Signature Integrity in Resource-Constrained Cryptocurrency Wallets

Abstract

Cryptocurrency wallets operating in constrained environments, such as embedded microcontrollers,
are particularly vulnerable to security breaches due to limited computational capabilities and inadequate entropy
sources. Secure key generation and maintaining digital signature integrity are critical components for ensuring the
authenticity and non-repudiation of transactions in such wallets. This paper proposes a lightweight, resilient key
generation framework tailored specifically for resource-constrained cryptocurrency wallets. We begin by analyzing
the entropy sources and identifying bottlenecks that impact the robustness of the key generation process. A novel
pseudo-random number generator (PRNG) seeding strategy is presented, incorporating environmental noise and
temporal variability to enhance entropy without imposing additional hardware requirements. The framework is
validated through simulations and implementation on microcontroller-based wallet prototypes. Our results
demonstrate that the proposed method maintains high entropy levels, supports secure digital signature creation, and
resists common attacks such as replay and key-prediction attempts. The framework balances security and
performance, ensuring that critical cryptographic operations can be performed reliably even in low-resource
environments. This study advances secure cryptographic design tailored for constrained devices, ensuring
transaction integrity and user trust in emerging lightweight blockchain applications.