https://dl.ucsc.cmb.ac.lk/jspui/handle/123456789/4301 Mon, 27 Apr 2026 03:49:56 GMT 2026-04-27T03:49:56Z https://dl.ucsc.cmb.ac.lk/jspui/handle/123456789/4433 Title: Real-Time Mobile Decodable Data Encoding Algorithm for Video Steganography Authors: Madhushan, G.K.L.U. Abstract: Steganography techniques are progressively gaining more attention among the general communities, with the recent enhancement of information security. Different kinds of steganography architectures support the implementation of advanced security systems. The existing steganography system provides many algorithms for encoding and decoding information to the cover media. Cover media can be a sound, image, video like bit-stream can encode data. However, the existing methods do not provide a way to decode such information using a mobile camera without directly accessing encoded media. Thus, despite the mobile extractable steganography model, it lost many opportunities within the real-world business domain. This dissertation investigates the feasibility of the mobile decodable video steganography method combined with the cryptography model. This study provides a QR code similar structure combined with a steganography algorithm to propose a newer algorithm to encode and decode data. That newer algorithm supports mobile extractable steganography. The proposed encoding ways, in this study, are known as ‘Hard’ and ‘Soft’ models. It integrates with videos using a prototype application. The proposed two models evaluate using an image similarity evaluation technique. PSNR, MSE, and SSIM values use as quantitative measures for evaluation. Also, security implementation evaluates using the implementation of a mobile-based video decoding application as the proof-of concept. The evaluation proposed ‘Hard’ mechanism given more robust and success probability than ‘Soft’ encode model. However, in that way, video quality more degrade. The summarizing evaluation results can say to the world as new knowledge, mobile extractable video steganography model feasible and can give newer propose algorithms to the world. Wed, 04 Aug 2021 00:00:00 GMT https://dl.ucsc.cmb.ac.lk/jspui/handle/123456789/4433 2021-08-04T00:00:00Z https://dl.ucsc.cmb.ac.lk/jspui/handle/123456789/4432 Title: Security Protocol for Delay Tolerant Networks Authors: Navin, S.M.D. Abstract: As a student of the Master of Information Security degree program, University of Colombo School of Computing, Sri Lanka, I am taking this occasion to express my gratitude to the University of Colombo School of Computing and also the people who helped to be a success with this project. I wish to express my sincere appreciation to my supervisor, Dr.Kasun De Zoysa , Senior Lecturer at University of Colombo School of Computing, the advisor Dr. Damith Karunaratne, Senior Lecturer at University of Colombo School of Computing and Prof. Christian Rohner of the Uppsala University. They have convincingly guided and encouraged me. Contribution of the Department of Examinations, Sri Lanka, is genuinely appreciated. Especially the Commissioner of the General Department of Examinations, Sri Lanka and his team. I wish to acknowledge the support and love my family, including my late father, gave me to successfully complete the dissertation. Unwavering support of Dr. Buddy Liyanage, Mr. Susil Maduwage, Mr. Vincent Halahakone and Ms. Deepani Jayantha kept me going on and this work would not have been possible without their input. Wed, 04 Aug 2021 00:00:00 GMT https://dl.ucsc.cmb.ac.lk/jspui/handle/123456789/4432 2021-08-04T00:00:00Z