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 .