Date of Publication :16th May 2017

Abstract: Mobile ad hoc network are a kind of wireless ad hoc network that usually has a routable networking environment on top of a link layer ad hoc network. The technological growth in the field of wireless technologies provides communication between mobile users. Any invention is to say success, only if it is useful in a meaningful manner. Wireless technology is the one that will help an emergency needy like in any natural disaster, emergency rescue operations, military battle-field etc. With the advent of Mobile Ad-Hoc Networks, an immediate self-configuring network can be created. Being an open network, security is the main concern for MANETs. In such situations to protect the confidentiality of the message to be transmitted, cryptography is the one of the solution. The process of converting the original data into a secret form is known as cryptography. It hides the actual information and sends the encrypted message. At the destination end, the message can be recovered by using decryption. Here we are proposing a new encryption technique named as Letter-Shape Encryption. This method exchanges different shapes for letters in a message to be transmitted. This approach is safe against man in middle attacks.

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