\bib{1985/elgamal-log} \yr 1985 \mr 86j:11130 \by Taher ElGamal \paper A subexponential-time algorithm for computing discrete logarithms over GF$(p^2)$ \jour IEEE Transactions on Information Theory \issn 0018--9448 \vol 31 \pages 473--481 \seeolder \cite{1984/elgamal-log-draft} \endref