Don Coppersmith
Cryptologia
A new algorithm for computing Hadamard transforms is presented. If n is a power of four, then the new algorithm uses ⅞ n logn multiply/adds to compute a Hadamard transform of length n. © 1994 IEEE
Don Coppersmith
Cryptologia
Roy L. Adler, Don Coppersmith, et al.
IEEE Trans. Inf. Theory
Ephraim Feig
Journal of Algorithms
Zeev Barzilai, Don Coppersmith, et al.
IEEE TC