Title	Interoperability Mechanisms for Registration and Authentication on Different Open DRM Platforms
Author	Carlos Serr?o, Victor Torres, Jaime Delgado, Miguel Dias
Citation	Vol. 6  No. 12  pp. 291-303
Keywords	DRM, interoperability, security, registration, authentication

Title	Hybrid adaptation of the maximum contention window (CWmax) and minimum contention window (CWmin) for Enhanced Service Differentiation in IEEE 802.11 Wireless Ad-hoc Networks
Author	Hassan Takabi, Ali H. Moghadam, Ahmad Khonsari
Citation	Vol. 6  No. 12  pp. 281-290
Keywords	IEEE 802.11e, QoS, EDCA, back-off algorithm, wireless ad-hoc networks, hybrid adaptation algorithm, CWmax, CWmin

Title	Research on Constructing an Internet-based Multi-step Security System
Author	Hoesung Ki, Seongjin Ahn
Citation	Vol. 6  No. 12  pp. 275-280
Keywords	Multi-step security system, firewall, intrusion detection system, intrusion prevention system, virus wall, security system construction model.

Title	A Multiauthority Electronic Voting Protocol Based upon a Blind Multisignature Scheme
Author	Jian-Liang Lin, Hsiu-Feng Lin, Chih-Ying Chen, Chin-Chen Chang
Citation	Vol. 6  No. 12  pp. 266-274
Keywords	Blind multisignature, multiauthority, electronic election system.