International Journal of Computer Science Issues

More than a traditional journal...

A novel hybrid cryptosystem which is resistant to quantum algorithm is developed. The system is combined with multivariate cryptosystem and chaotic system, two systems which are both secure under quantum attacks. The plaintexts are displaced by an affine transformation and encrypted by central map in multivariable cryptosystem. And then, the outputs of central map act as initial values in a two-dimension chaos system and are transformed by another affine transformation. Finally, the cipher texts are derived by adding the outputs of chaos system and the second affine transformation. Due to the chaos system, the shortcomings of traditional multivariate cryptosystems are offset and therefore the security is enhanced. The analysis shows that the proposed signature system is able to resist common attacks.