A New Chaos-based Text Encryption to Secure GPS Data

This paper, proposes a new chaos based cryptosystem for ciphering text which is used to ensure the confidentiality of data and the privacy in different applications such as: sending Short Message System (SMS) in Global System for Mobile Communication (GSM) networks, text messages exchanged in social networks, Global Position System (GPS) tracker, etc. In our work, we are interested to GPS tracker, this embedded system consists of a GPS receiver, a micro-controller and secured wireless communication. The GPS receiver and wireless communication are both in the same module (SIM808), the micro-controller is the Mbed NXP LPC1768 board. In order to meet both the security requirements and the strong constraints of embedded systems, the proposed crypto-system is designed using the secret key cryptography technique based on chaos theory which is more suitable than the public key cryptography technique in many embedded applications. Our proposed keystream generator is based on Lorenz chaotic system. To ensure that the proposed crypto-system is robust and satisfy the Shannon requirements in terms of confusion and diffusion, we have used bitwise operation to ensure the confusion propriety while the diffusion propriety is achieved by the permutation technique using the Arnold's cat map.