Simulation and Application of Soft Input Decryption

This paper presents a model for a software simulation of the algorithm of Soft Input Decryption. Soft Input Decryption is the algorithm which uses L-values (soft output) of a Soft Input Soft Output channel decoder for the correction of secured data blocks modified during the transmission over a noisy channel. It is based on the combination of cryptography and channel coding. Results of simulations show improvement of the number of correct data blocks if Soft Input Decryption is used. Additionally, mathematical equations are derived showing expected results of simulations for longer data blocks.