ECC dynamic point encoding on mobile device

Elliptic Curve Cryptography (ECC) gains attention due to the security efficiency with lower computational cost for mobile devices. However, the security achievement for ECC depends on the encoding process to transform a plaintext into a point or more on an elliptic curve. In this paper, we propose an encoding method based on a dynamic point encoding. A character is encoded depending on two factors: its sequence and its ASCII value. This technique ensures against frequency cryptanalysis. We also compare our work with the existing encoding techniques in various dimensions such as computational complexity, time, resource, and security constraints. Dynamic point encoding technique consumes less memory storage than other dynamic encoding techniques while the computational complexity is equal to O(N).