STEAC: Towards secure, traceable, and efficient cryptographic access control scheme in smart healthcare

【Author】 Deng, Weiwei; Xiang, Tao; Liao, Xiaofeng

【Source】MULTIMEDIA TOOLS AND APPLICATIONS

【影响因子】2.577

【Abstract】Smart Healthcare (SHC) plays an increasingly greater role in improving the quality of health care, which has been widely concerned by researchers, hospitals and governments. In SHC, it is crucial that a patient's health data is readily accessible to authorized nurses, doctors, and emergency services. To realize the easy access while protecting the privacy of patients' data, ciphertext-policy attribute-based encryption (CP-ABE) has been widely used to achieve secure data sharing and support fine-grained access control. However, the existing CP-ABE schemes have three flaws for SHC. First, CP-ABE with partially hidden of access policies may also leak user's attribute privacy. Second, malicious user may disclose patient's health records and these records can not be traced. Third, it is less efficient that the data user, who does not have right to access data, downloads the whole ciphertext. In this paper, we design STEAC to address the above problems. To solve the first problem, we introduce the garbled Bloom filter method to realize fully hidden of access policies. For solving the second problem, we use the transaction-based blockchain scheme to trace the ciphertext storage and access. And before the real decryption, a decryption test operation is added to overcome the third flaw. Finally, security analysis and comprehensive performance evaluation also demonstrate STEAC is secure in standard model and is also more efficient than the previous schemes.

【Keywords】Smart healthcare; Access control; CP-ABE; Multimedia Security; Blockchain

【发表时间】

【收录时间】2022-04-28

【文献类型】理论性文章

【主题类别】

区块链应用-实体经济-医疗领域