The concept of attribute-based encryption was first proposed by [[Amit Sahai]] and [[Brent Waters]] <ref>Amit Sahai and Brent Waters, Fuzzy Identity-Based Encryption ''[http://eprint.iacr.org/2004/086 Cryptology ePrint Archive, Report 2004/086]'' (2004)</ref> and later by Vipul Goyal, Omkant Pandey, [[Amit Sahai]] and Brent Waters.<ref name=":0">Vipul Goyal, Omkant Pandey, Amit Sahai and Brent Waters, Attribute-Based Encryption for Fine-Grained Access Control of Encrypted Data ''[https://eprint.iacr.org/2006/309.pdf ACM CCS (2006)]''</ref> Recently, several researchers have further proposed attribute-based encryption with multiple authorities who jointly generate users' private keys.<ref>[[Melissa Chase]], Multi-authority Attribute-Based Encryption ''[https://link.springer.com/chapter/10.1007%2F978-3-540-70936-7_28 TCC (2007)]''</ref><ref>[[Melissa Chase]] and Sherman S.M. Chow, Improving privacy and security in multi-authority attribute-based encryption ''[http://dl.acm.org/citation.cfm?id=1653678 ACM CCS (2009)]''</ref><ref>Taeho Jung, Xiang-Yang Li, Zhiguo Wan, and Meng Wan, Privacy preserving cloud data access with multi-authorities ''[http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6567070&tag=1 IEEE INFOCOM (2013)]''</ref><ref>Taeho Jung, Xiang-Yang Li, Zhiguo Wan, and Meng Wan, Control Cloud Dhttps://gnunet.org/sites/default/files/CCS%2706%20-%20Attributed-based%20encryption%20for%20fine-grained%20access%20control%20of%20encrypted%20data.pdfata Access Privilege and Anonymity With Fully Anonymous Attribute-Based Encryption ''[http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=6951492 Transactions on Information Forensics and Security (2015)]''</ref><ref>Allisso Lewko and Brent Waters, Decentralizing Attribute-Based Encryption ''[https://link.springer.com/chapter/10.1007%2F978-3-642-20465-4_31 EUROCRYPT (2011)]''</ref><ref>Sascha Muller, Stefan Katzenbeisser, and Claudia Eckert, On multi-authority ciphertext-policy attribute-based encryption ''[http://143.248.27.21/mathnet/thesis_file/14_B08-591.pdf Bull. Korean Math. Soc. 46 (2009)]''</ref>
