Herranz, Javier: 'Attribute-based encryption implies identity-based encryption', IET Information Security, 2017, 11, (6), p. 332-337, DOI: 10.1049/iet-ifs.2016.0490 IET Digital Library, https://digital-library.theiet.org/;jsessionid=k127sj5548jl.x-iet-live-01content/journals/10.1049/iet-ifs.2016.0490