Security Analysis on Yu et al.’s Group Certificate Digital Signature Scheme for EMR Authentication Process

Electronic medical records (EMR) have gradually replaced paper-based medical records with the advance of information technology in recent years. For preserving the same legal effect with paper-based medical records, it is important for EMR to maintain its content integrity and access history by using digital signature technology. In 2014, Yu et al. have proposed an efficient forward-secure group certificate digital signature scheme to enhance EMR authentication process by reducing the total number of keys required within a hospital organization when comparing with traditional PKI implementation. In this study, we evaluated Yu et al.’s scheme in terms of security robustness and found that Yu et al.’s scheme has some vulnerabilities through our security