A decoding and error correcting method is applicable to a secured code word that may have an error relative to an initial secured code word. The method includes an error correcting step, and a decoding step using a decoding function. The decoding step may be carried out before the error correcting step, and includes applying the decoding function to the secured code word to obtain a secured decoded word containing a coded error. The method reduces the decoding and error correcting time of the secured code word.