Adaptable key-policy attribute-based encryption with time interval

• Main Authors: MA, Siqi, LAI, Junzuo, DENG, Robert H., DING, Xuhua
• Format: text
• Language: English
• Published: Institutional Knowledge at Singapore Management University 2016
• Subjects: Adaptability; Adaptable key-policy attribute-based encryption; Time specific; Computer Sciences; Information Security
• Online Access: https://ink.library.smu.edu.sg/sis_research/3590; https://ink.library.smu.edu.sg/context/sis_research/article/4591/viewcontent/Ma2017_Article_AdaptableKey_policyAttribute_av.pdf
• Institution: Singapore Management University

In this paper, we introduce a new cryptographic primitive: adaptable KP-ABE with time interval (KP-TIABE), which is an extension of key-policy attribute-based encryption (KP-ABE). Adaptable KP-TIABE specifies a decryption time interval for every ciphertext such that the ciphertext can only be decrypted within this time interval. To be more flexible, the decryption time interval associated with a ciphertext can be adjusted on demand by a semi-trusted server. We propose a formal model for adaptable KP-TIABE, present a concrete adaptable KP-TIABE scheme and prove its security under the security model.