🤖 AI Summary
This study investigates the effectiveness of hardware-based security mechanisms—specifically boot chain integrity, Trusted Execution Environment (TEE) isolation, and hardware-bound key protection—when smartphones are reused outside their native ecosystems. Leveraging the PinePhone open hardware platform, the work presents the first systematic analysis of the challenges in re-establishing trust during cross-environment device reuse. Through empirical validation of the boot chain, TEE isolation testing, and key protection experiments, the research demonstrates that existing vendor lock-in mechanisms significantly impede secure device repurposing. The paper articulates fundamental requirements for secure smartphone reuse and shows that current closed security architectures are ill-suited to support sustainable utilization beyond their original, vendor-controlled environments.
📝 Abstract
An estimated 5.3 billion mobile phones became electronic waste in 2022. Many of these devices can be repurposed and used in different contexts to extend their lifetime and to reduce ecological impacts. An often overlooked aspect of smartphone reuse is cybersecurity: these devices embed hardware-backed security mechanisms that rely on vendor-controlled provisioning and are designed for a fixed device lifecycle. In this paper, we investigate whether security mechanisms and guarantees remain effective when devices are repurposed outside their original ecosystem. We explore security features in a PinePhone, an open-hardware smartphone, and focus on three core security aspects: boot chain integrity, isolation provided by the Trusted Execution Environment, and the protection of hardware-bound secrets. Our experiments simulate realistic repurposing scenarios and highlight the complexity of reconstructing trust anchors. We generalize our observations to infer requirements for secure repurposing and illustrate how vendor locked mechanisms hinder the repurposing of a majority of discarded devices.