정동현, 이중희, 김범중,

Vol. 34, No. 5, pp. 1021-1035, 10월. 2024
10.13089/JKIISC.2024.34.5.1021, Full Text:
Keywords: Blockchain, Offline Payment, Trusted Execution Environment (TEE)
Abstract

This paper proposes the TEE-BOP (Trusted Execution Environment-Based Blockchain Offline Payment) protocol for blockchain-based offline payments. TEE-BOP securely manages offline balances within a Trusted Execution Environment (TEE) and efficiently verifies initial deposit proofs recorded on the blockchain using Merkle trees. Additionally, it ensures secure and tamper-proof transactions in offline environments by guaranteeing the reliability of keys and the system through TEE Attestation. Unlike previous studies, TEE-BOP enhances real-world applicability by eliminating dependence on central authorities and avoiding assumptions of ideal models. The protocol solves the double-spending problem through multi-layered defense mechanisms and addresses forgery prevention by allowing recipients to directly verify data consistency between the TEE and the blockchain. This enables reliable blockchain-based offline payments in areas with unstable network infrastructure. It demonstrates that this research can expand the application of blockchain technology and contribute to improving access to financial services in developing countries or disaster situations.

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