This book constitutes the thoroughly refereed post-conferenceproceedings of the Joint Workshop
on Automated Reasoning for Security Protocol Analysis and Issues in the Theory of Security
ARSPA-WITS 2009 held in York UK in March 2009 in association with ETAPS 2009. The 12
revised full papers presented together with 2 invited talks werecarefully reviewed and selected
from 27 submissions. The papers featuretopics including formal specification analysis and
design of security protocols and their applications the formal definition of various aspects
of security such as access control mechanisms mobile code security and denial-of-service
attacks the modeling of information flow and its application to confidentiality policies
system composition and covert channel analysis.
