Breaking an orbit-based symmetric cryptosystem
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KünyeSolak, E., Rhouma, R., & Belghith, S. (2011). Breaking an orbit-based symmetric cryptosystem. Mathematical and Computer Modelling, 54(5), 1413-1419. doi:10.1016/j.mcm.2011.04.012
We report a break for a recently proposed class of cryptosystems. The cryptosystem uses constant points of a periodic secret orbit to encrypt the plaintext. In order to break the system, it suffices to sort the constant points and find the initial fixed point. We also report breaks for modified versions of the cryptosystem. In addition, we discuss some efficiency issues of the cryptosystem.