신뢰 실행 환경의 안전한 TPM 활용을 위한 보안 기술
Secure Mobile TPM Adoption for the Trusted Execution Environment
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초록
ARM TrustZone과 같은 신뢰 실행 환경(Trusted Execution Environment, TEE) 기술은 보안에 민감한 데이터나 중요 로직을 보호하기 위해 사용되고 있다. 특히 암호 연산은 신뢰 실행 환경 내에서 실행되는 중요 로직 중의 하나로써 디지털 권한 관리(Digital Right Management, DRM)와 같은 보안기술 구현에 활용되고 있다. 하지만 Raspberry Pi와 같은 저사양 기기의 경우 높은 엔트로피를 제공하는 암호화 하드웨어 대신 상대적으로 취약한 소프트웨어 기반 암호화 기술(예: 의사 난수)에 의존한다. 본 논문은 저사양 기기상 신뢰 실행 환경의 보안성 향상을 위해 가상화 기술을 활용하여 모바일 TPM(Trusted Platform Module)과 신뢰 실행 환경을 안전하게 접목하는 방법을 제안한다. 제안된 방식은 신뢰 실행 환경 외에서 TPM 커널 모듈을 안전하게 재사용할 수 있으므로 기존 신뢰 실행 환경에 새로운 위협요소를 추가하지 않는다는 장점을 지닌다.
Abstract
The trusted execution environment (TEE) such as ARM TrustZone is widely adopted to protect security-critical logic and data. Specifically, the crypto operation is generally hosted in the TEE and leveraged to build various trusted services (e.g., DRM). Although the crypto operation plays a critical role in the TEE, low-end devices depend on a software-based crypto service, which provides a limited randomness-entropy than that of the hardware-based crypto service. To alleviate this problem, we propose a way to efficiently combine the mobile trusted platform module (TPM) with the TEE. We utilize hardware-assisted virtualization to reuse and protect the TPM kernel driver instead of directly porting it to the TEE. By doing so, we minimize the potential threat that may be introduced by bloating the TEE.
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