This, the 29th issue of the Transactions on Computational Science journal, is comprised of seven full papers focusing on the area of secure communication. Topics covered include weak radio signals, efficient circuits, multiple antenna sensing techniques, modes of inter-computer communication and fault types, geometric meshes, and big data processing in distributed environments.

Analysis of Relationship between Modes of Intercomputer Communications and Fault Types in Redundant Computer Systems.- Efficient Circuit Design of Reversible Square.- Methods of Registration of Weak Radio Signals.- A Novel Multiple Antennas Based Centralized Spectrum Sensing Technique.- ImatiSTL - Fast and Reliable Mesh Processing with a Hybrid Kernel.- Processing Large Geometric Datasets in Distributed Environments.- Decision Fusion for Classification of Content Based Image Data.