Abstract
AbstractMaking friends by sharing personal data has become popular in online social networks (OSNs). Security is a major concern, as an OSN service provider (OSN-SP) is semi-trusted and for-profit, while malicious users might also gather data for improper uses. Encryption of data is a straightforward solution, but interactive sharing of encrypted data becomes a challenging task. In this paper, we propose Masque, a novel access control mechanism employing attribute-based encryption (ABE), as a hierarchical solution for interactive sharing of encrypted data in OSNs. Based on key-policy ABE, it allows the OSN-SP to manage users at a high level but without being able to access their sensitive data. At the same time, based on ciphertext-policy ABE, it enables users to customize their own access policies specifically.KeywordsOnline social networksecurityattribute-based encryptiondata sharing
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