An Efficient and Secure Data Sharing Method Using Asymmetric Pairing with Shorter Ciphertext to Enable Rapid Learning...

Area of Science:

• Cloud Computing
• Cryptography
• Healthcare Informatics

Background:

• Cloud computing enables flexible, cost-effective real-time data sharing in healthcare.
• Securely sharing diverse data from multiple users to various subscribers in the cloud is a significant challenge.
• Existing broadcast encryption systems are inefficient for sensitive data sharing, particularly for scenarios like COVID-19 data privacy.

Purpose of the Study:

• To propose an efficient and secure data sharing method for cloud-based electronic healthcare systems.
• To address the challenge of securely sharing sensitive data, such as COVID-19 information, among different user groups.
• To improve upon standard broadcast encryption by utilizing multichannel broadcast encryption.

Main Methods:

• Implementation of a secure data sharing method in a public key setting.
• Utilization of asymmetric (Type-III) pairings for efficiency and security.
• Security proof based on the decisional BDHE complexity assumption without using a random oracle.

Main Results:

• The proposed method achieves efficient and secure data sharing.
• The system generates shorter ciphertexts compared to existing methods.
• The Type-III pairing setting offers optimal efficiency and security.

Conclusions:

• The developed multichannel broadcast encryption method provides an efficient and secure solution for data sharing in cloud healthcare.
• The system enhances data privacy for sensitive information like COVID-19 data.
• The method is semantically secure and practical for real-world applications.