Secrecy capacity of wiretap channel for a new scenario and designing code for wiretap channel

The concept of information theoretic security is introduced. Secrecy capacity of two receiver broadcast channel for a new scenario is derived in which it is assumed that the legitimate receiver has access to a noisy version of eavesdroppers channel outputs. Also the ideas of code designing to achieve zero error on main channel and perfect secrecy on the eavesdropper´s channel, without invoking complicated capacity achieving codes are provided.