Mobile Text Chatting (MTC) is the most widely used communications of today because it is cheap, efficient, simple, and is easily available. Its far-reaching capacity enables user to be ‘at-hand’ at all times with friends and family. Just like in a conventional communication where privacy is maintained and given importance, communication via smart portable devices should have a certain degree of security as well. The reason for this is natural since, as humans, we are entitled to our own world at times, apart from this global village we are in which has been the result of the fast and improving technological advances that aims to make our life easier.
For simple and short message exchanges in mobile devices, a simple encryption will do. In every encryption, it will only be reliable if only if the integrity of the key is protected. In this paper, two encryption algorithms for mobile message sending will be discussed. Both aims to provide a certain degree of encryption to messages exchange via the Internet and/or mobile communication service providers.
Classical ciphers; substitution, shift and transposition ciphers are the basis of the schemes provided herein. Management of secret key is also emphasized and given examples. Methods to encrypt and decrypt is explained by providing examples, too.
