\input zb-basic \input zb-ioport \iteman{io-port 05658318} \itemau{Bras-Amor\'os, Maria; O'sullivan, Michael E.} \itemti{From the Euclidean algorithm for solving a key equation for dual Reed-Solomon codes to the Berlekamp-Massey algorithm.} \itemso{Bras-Amor\'os, Maria (ed.) et al., Applied algebra, algebraic algorithms and error-correcting codes. 18th international symposium, AAECC-18, Tarragona, Sapin, June 8--12, 2009. Proceedings. Berlin: Springer (ISBN 978-3-642-02180-0/pbk). Lecture Notes in Computer Science 5527, 32-42 (2009).} \itemab Summary: The two primary decoding algorithms for Reed-Solomon codes are the Berlekamp-Massey algorithm and the Sugiyama et al. adaptation of the Euclidean algorithm, both designed to solve a key equation. This article presents a new version of the key equation and a way to use the Euclidean algorithm to solve it. A straightforward reorganization of the algorithm yields the Berlekamp-Massey algorithm. \itemrv{~} \itemcc{} \itemut{} \itemli{doi:10.1007/978-3-642-02181-7\_4} \end