@Article{cmes.2022.019589,
AUTHOR = {Yanan Chen, Ting Yao, Haiping Ren, Zehao Gan},
TITLE = {Unidirectional Identity-Based Proxy Re-Signature with Key Insulation in EHR Sharing System},
JOURNAL = {Computer Modeling in Engineering \& Sciences},
VOLUME = {131},
YEAR = {2022},
NUMBER = {3},
PAGES = {1497--1513},
URL = {http://www.techscience.com/CMES/v131n3/47411},
ISSN = {1526-1506},
ABSTRACT = {The introduction of the electronic medical record (EHR) sharing system has made a great contribution to the
management and sharing of healthcare data. Considering referral treatment for patients, the original signature
needs to be converted into a re-signature that can be verified by the new organization. Proxy re-signature (PRS) can
be applied to this scenario so that authenticity and nonrepudiation can still be insured for data. Unfortunately, the
existing PRS schemes cannot realize forward and backward security. Therefore, this paper proposes the first PRS
scheme that can provide key-insulated property, which can guarantee both the forward and backward security of
the key. Although the leakage of the private key occurs at a certain moment, the forward and backward key will not
be attacked. Thus, the purpose of key insulation is implemented. What’s more, it can update different corresponding
private keys in infinite time periods without changing the identity information of the user as the public key. Besides,
the unforgeability of our scheme is proved based on the extended Computational Diffie-Hellman assumption in
the random oracle model. Finally, the experimental simulation demonstrates that our scheme is feasible and in
possession of promising properties.},
DOI = {10.32604/cmes.2022.019589}
}