Complexity of the emerging communication environment is increasing with the induction of new hardware / software. In emerging ubiquitous environment current encryption mechanisms are not effective due to certain constraints. To protect critical information in ubiquitous environment, dynamism in security mechanism is required. This book provides an agent based encryption framework focused on the concept of Self-Organizing Encryption mechanism. Proposed security structure is providing solutions to information security problems in ubiquitous environment. Suitable method has been discussed for emerging environments where resource limitation and change in environment are more influential. Due to its evolving nature this framework can work not only for existing but also for emerging technologies as well. This book will be suitable for researchers and students engaged with encryption mechanisms especially in ubiquitous environment.