IoT 환경에서 활용 가능한 안전한 의료 데이터 공유 기법
Secure Medical Data Sharing Techniques that Can Be Utilized in IoT Environments
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초록
최근 개인정보 이동권을 위한 마이데이터 사업이 의료분야까지 확장하고 있다. 모든 연령대를 대상으로 의료 및 헬스케어 산업 확산을 위해선 낮은 비용으로 보급할 수 있는 IoT 기기들을 활용하여 안전하게 의료 데이터를 공유할 수 있는 기법이 필요하다. 최근 Qiu 등은 데이터와 암호키를 데이터 암호화에 사용함으로 암호화 키가 외부에 노출돼도 안전한 의료 데이터 공유기법을 제안하였다. 그러나 Qiu 등의 기법은 N개의 의료기관과 자신의 의료 데이터를 공유하기 위해선 N개의 복호화 키를 기기에 저장해야 한다는 특징을 가진다. 이에 따라 키 관리의 문제가 발생하고, 사용자 기기 측면에서는 저장공간 오버헤드와 추가적인 검색연산이 요구된다는 한계점을 가진다. 본 논문에서는 Qiu 등의 기법을 발전시켜 의료 데이터 공유 대상의 수가 증가하여도 사용자 기기 관점에서 효율적인 의료 데이터 공유 기법을 제안한다. 하나의 키로부터 나머지 키를 파생시키는 키 생성 기법을 제안함으로써 사용자 기기 측면에서 저장공간 오버헤드가 발생하지 않으며, 추가적인 검색연산이 필요 없어 저사양 기기에서 활용 가능하다. 비교 실험의 결과 제안된 기법이 Qiu 등의 기법에 비해 키 생성 시간을 포함한 암호화 시간은 0.05초가 빠르며, 에너지 소비는 4.3% 적어 시간, 에너지 측면에서도 효율적이다.
Abstract
The MyData initiative for personal data portability has recently expanded into the medical field. A method for securely sharing medical data using low-cost IoT devices is essential for widespread adoption of healthcare services across all age groups. Qiu et al. proposed a secure medical data sharing technique using both data and encryption keys, ensuring safety even if the encryption key is exposed. However, their method requires storing N decryption keys for N medical institutions, leading to key management issues, storage overhead, and additional search operations on user devices. This paper presents an improved method based on Qiu et al.'s technique, maintaining efficiency from the user device perspective as the number of data sharing targets increases. We propose a key generation technique deriving multiple keys from a single key, eliminating storage overhead and additional search operations, thus suitable for low-spec devices. Experimental results show our method is 0.05 seconds faster in encryption time (including key generation) and consumes 4.3% less energy compared to Qiu et al.'s method, demonstrating improved efficiency in time and energy consumption.
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