[u' @incollection{naranjo_extending_2014, series = {Advances in {Intelligent} {Systems} and {Computing}}, title = {Extending a {User} {Access} {Control} {Proposal} for {Wireless} {Network} {Services} with {Hierarchical} {User} {Credentials}}, copyright = {\xa92014 Springer International Publishing Switzerland}, isbn = {978-3-319-01853-9 978-3-319-01854-6}, url = {http://link.springer.com/chapter/10.1007/978-3-319-01854-6_61}, abstract = {We extend a previous access control solution for wireless network services with group-based authorization and encryption capabilities. Both the basic solution and this novel extension focus on minimizing computation, energy, storage and communications required at sensors so they can be run in very constrained hardware, since the computations involved rely on symmetric cryptography and key derivation functions. Furthermore, no additional messages between users and sensors are needed. Access control is based on user identity, group membership and time intervals.}, number = {239}, urldate = {2013-08-13TZ}, booktitle = {International {Joint} {Conference} {SOCO}\u201913-{CISIS}\u201913-{ICEUTE}\u201913}, publisher = {Springer International Publishing}, author = {Naranjo, Juan \xc1lvaro Mu\xf1oz and G\xf3mez-Goiri, Aitor and Ordu\xf1a, Pablo and L\xf3pez-de-Ipi\xf1a, Diego and Casado, Leocadio Gonz\xe1lez}, editor = {Herrero, \xc1lvaro and Baruque, Bruno and Klett, Fanny and Abraham, Ajith and Sn\xe1\u0161el, V\xe1clav and Carvalho, Andr\xe9 C. P. L. F. de and Bringas, Pablo Garc\xeda and Zelinka, Ivan and Quinti\xe1n, H\xe9ctor and Corchado, Emilio}, month = jan, year = {2014}, keywords = {Computational Intelligence, Internet of Things, Security, access control, ambient intelligence, group-based authorization, ubiquitous computing, wireless network services}, pages = {601--610} }']