Attribute-based encryption is knownprovably<ref name="Herranz2017">{{cite journal | last1 = Herranz | first1 = Javier | title = Attribute‐based encryption implies identity‐based encryption | journal = IET Information Security | date = November 2017 | volume = 11 | issue = 6 | pages = 332–337 | issn = 1751-8709 | eissn = 1751-8717 | doi = 10.1049/iet-ifs.2016.0490 | pmid = | url = }}</ref> to be a generalisation of [[Identity-based encryption]], itself a generalisation of [[Functional encryption|functional encryption]] and therefore of public key encryption.
