Contributed Papers -- A Cryptographically Sound Security Proof of the Needham-Schroeder-Lowe Public-Key Protocol -- Constructions of Sparse Asymmetric Connectors -- A Separation Logic for Resource Distribution -- An Equational Theory for Transactions -- Axioms for Regular Words -- 1-Bounded TWA Cannot Be Determinized -- Reachability Analysis of Process Rewrite Systems -- Pushdown Games with Unboundedness and Regular Conditions -- Real-Time Model-Checking: Parameters Everywhere -- The Caucal Hierarchy of Infinite Graphs in Terms of Logic and Higher-Order Pushdown Automata -- Deciding the Security of Protocols with Diffie-Hellman Exponentiation and Products in Exponents -- Subtyping Constraints in Quasi-lattices -- An Improved Approximation Scheme for Computing Arrow-Debreu Prices for the Linear Case -- Word Equations over Graph Products -- Analysis and Experimental Evaluation of a Simple Algorithm for Collaborative Filtering in Planted Partition Models -- Comparing Sequences with Segment Rearrangements -- On Logically Defined Recognizable Tree Languages -- Randomized Time-Space Tradeoffs for Directed Graph Connectivity -- Distance-Preserving Approximations of Polygonal Paths -- Joint Separation of Geometric Clusters and the Extreme Irregularities of Regular Polyhedra -- On the Covering Steiner Problem -- Minimality Results for the Spatial Logics -- Algorithms for Non-uniform Size Data Placement on Parallel Disks -- Efficient Algorithms for Abelian Group Isomorphism and Related Problems -- Quasi-polynomial Time Approximation Algorithm for Low-Degree Minimum-Cost Steiner Trees -- Model Checking and Satisfiability for Sabotage Modal Logic -- Merging and Sorting By Strip Moves -- The Macro Tree Transducer Hierarchy Collapses for Functions of Linear Size Increase -- Distributed Games -- Maintenance of Multidimensional Histograms -- Tagging Makes Secrecy Decidable with Unbounded Nonces as Well -- Quantum and Classical Complexity Classes: Separations, Collapses, and Closure Properties -- On the Greedy Superstring Conjecture -- Invited Papers -- Reasoning about Infinite State Systems Using Boolean Methods -- Stringent Relativization -- Component-Based Construction of Deadlock-Free Systems -- Moderately Hard Functions: From Complexity to Spam Fighting -- Zigzag Products, Expander Constructions, Connections, and Applications.