Attribute-based searchable encrypted electronic medical record system and encryption method

Abstract

The invention discloses an attribute-based searchable encrypted electronic medical record system and an encryption method. The system comprises a key distribution center and a cloud storage center, wherein the key distribution center generates public parameters and a master key to initialize the system; the key distribution center generates and distributes keys containing user attributes to users;a data owner sets an access strategy before uploading medical record data, encrypts the data, and then uploads the data to the cloud storage center; a data visitor generates a trap door according tokeywords and the keys, and provides a query request to the cloud storage center; and after receiving the query request, the cloud storage center determines to return corresponding encrypted data to the data visitor according to the trap door and keyword ciphertexts. According to the scheme of the invention, the difficulty of key management in a multi-user environment can be reduced, data users canbe supported to accurately query the keywords of the ciphertexts, guessing attacks of the keywords can be resisted, and the leakage of privacy data can be effectively prevented.

Description

technical field [0001] The invention relates to cryptography technology in cloud computing, in particular to an attribute-based searchable encrypted electronic medical record system and an encryption method. Background technique [0002] With the rapid development of electronic medical systems and cloud computing, many enterprise users and individuals have begun to migrate data to cloud server storage, so as to avoid cumbersome local data management and obtain more convenient services. The emergence of emerging services brings convenience to users, but also brings security risks. For data stored in the cloud, users do not want employees in the cloud service center to be able to query their own information at will. is particularly important. In order to ensure data security and user privacy, data is generally stored in the cloud server in the form of ciphertext, but after traditional encryption technology encrypts a large amount of data and uploads it to the cloud, it is dif...

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