Security and Intelligent Information Systems International Joint Confererence, SIIS 2011, Warsaw, Poland, June 13-14, 2011, Revised Selected Papers - Bouvry,Pascal; Klopotek,Mieczyslaw A.; Leprevost,Franck; Marciniak,Malgorzata; Mykowiecka,Agnieszka; Rybinski,Henryk (Lecture Notes in Computer Science / Information Systems and Applications, incl. Internet/Web, and HCI Ser.)