In this paper, we implemented a new McEliece encryption scheme, which consists of a optimal cyclic code to correct errors of burst. Replaces the matrix permutation by a random interleavers. In place of the vector of random error is used a vector of error that also helps to detect and correct errors of slip. This new scheme improves the confiability of the system and on the other hand increases the reliability to make it more robust under an attack of a spy.