In today's world, data security is the main concern for anyone. Information security is the most extreme basic issue in guaranteeing safe transmission of data through the web. Data security ensures that our data is only accessible by the intended receiver and prevents any modification or alteration of data. In order to achieve this level of security, various cryptography algorithms and methods have been developed. This book proposes a new Dynamic Cryptography technique through which Security can be enhanced as it increases the complexity of solving the cipher text when handled by intruders.