MDS codes over finite fields

The mds (maximum distance separable) conjecture claims that a nontrivial linear mds $[n,k]$ code over the finite field $GF(q)$ satisfies $n \leq (q + 1)$,exceptwhen$q$isevenand$k = 3$or$k = q- 1$ in which case it satisfies $n\le (q+2)$. For given field $GF(q)$ and any given $k$, series of mds $[q+1,k]$ codes are constructed. Any $[n,3]$ mds or $[n,n-3]$ mds code over $GF(q)$ must satisfy $n\le (q+1)$ for $q$ odd and $n\le (q+2)$ for $q$ even. For even $q$, mds $[q+2,3]$ and mds $[q+2,q-1]$ codes are constructed over $GF(q)$. The codes constructed have efficient encoding and decoding algorithms.