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==History==
Identity-based encryption was first proposed in 1984 by [[Adi Shamir]],<ref name="Shamir pp. 47–53">{{cite book | last=Shamir | first=Adi | title=Advances in Cryptology | chapter=Identity-Based Cryptosystems and Signature Schemes | series=Lecture Notes in Computer Science | publisher=Springer Berlin Heidelberg | publication-place=Berlin, Heidelberg | isbn=978-3-540-15658-1 | doi=10.1007/3-540-39568-7_5 | pages=47–53 | date=1984| volume=196 }}</ref> without a specific solution or proof. In 2004 [[Amit Sahai]] and [[Brent Waters]]<ref>Amit Sahai and Brent Waters, Fuzzy Identity-Based Encryption ''[httphttps://eprint.iacr.org/2004/086 Cryptology ePrint Archive, Report 2004/086]'' (2004)</ref> published a solution, improved in 2006 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> [[Melissa Chase]] and other 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 ''[https://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 ''[https://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 (computer scientist)|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>
== Types of attribute-based encryption schemes ==
==Usage==
Attribute-based encryption (ABE) can be used for log encryption.<ref>Vipul Goyal, Omkant Pandey, Amit Sahai and Brent Waters, Attribute-Based Encryption for Fine-Grained Access Control of Encrypted Data ''[httphttps://eprint.iacr.org/2006/309.pdf Cryptology ePrint Archive, Report 2006/309]'' (2006)</ref> Instead of encrypting each part of a log with the keys of all recipients, it is possible to encrypt the log only with attributes which match recipients' attributes. This primitive can also be used for [[broadcast encryption]] in order to decrease the number of keys used.<ref>David Lubicz and Thomas Sirvent, Attribute-Based Broadcast Encryption Scheme Made Efficient ''[httphttps://perso.univ-rennes1.fr/david.lubicz/articles/attribute.pdf First International Conference on Cryptology in Africa]'' (2008)</ref> Attribute-based encryption methods are also widely employed in vector-driven search engine interfaces.<ref>{{cite journal |last1=Bouabana-Tebibel |first1=T |title=Parallel search over encrypted data under attribute based encryption on the Cloud Computing |journal=Computers & Security |date=2015 |volume=54|pages=77–91 |doi=10.1016/j.cose.2015.04.007 }}</ref>
===Challenges===
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