A communication device for generating a matrix-mapped sequence is described. Setting alternative data rates at integer multiples of the fundamental data rate of the optical communication system allows the system to process the respective integer number of symbols per period of the system, wherein the period of the system is the inverse of the fundamental data rate. In that way, specifically embedded systems without integrated security functions can be upgraded with cryptographic routines in a simple and cost effective manner. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.