7Crampton J, Martin K, Wild P. On key assignment for hierarchical access control. In: Guttan J, ed, Proc. of the 19th IEEE Computer Security Foundations Workshop--CSFW 2006. Venice: IEEE Computer Society Press, 2006. 5-7.
8Damiani E, De S, Vimercati C, Foresti S, Jajodia S, Paraboschi S, Samarati P. An experimental evaluation of multi-key strategies for data outsourcing. In: Venter HS, Eloff MM, Labuschagne L, Eloff JHP, Solms RV, eds. New Approaches for Security, Privacy and Trust in Complex Environments, Proc. of the IFIP TC-11 22nd Int'l Information Security Conf. Sandton: Springer-Verlag, 2007. 395-396.
9Bethencourt J, Sahai A, Waters B. Ciphertext-Policy attribute-based encryption. In: Shands D, ed. Proc. of the 2007 IEEE Symp. on Security and Privacy. Oakland: IEEE Computer Society, 2007. 321-334. [doi: 10.1109/SP.2007.11].
10Yu S, Ren K, Lou W, Li J. Defending against key abuse attacks in KP-ABE enabled broadcast systems. In: Bao F, ed. Proc. of the 5th Int'l Conf. on Security and Privacy in Communication Networks. Singapore: Springer-Verlag, http://www.linkpdf.com/ ebook-viewer.php?url=http://www.ualr.edu/sxyul/file/SecureCommO9_AFKP_ABE.pdf.