DES w/ variable S-boxes

Are there any implementations of DES-variants that use variable S-boxes? I've not seen any, and it seems to me that such an algorithm could be quite strong, considering the continuing strength of DES (i.e., only the rich or large gov'ts are likely to be able to break it today, and only by brute force). If not, is there likely to be enough demand that I should start coding? b& -- Ben.Goren@asu.edu, Arizona State University School of Music net.proselytizing (write for info): Protect your privacy; oppose Clipper. Voice concern over proposed Internet pricing schemes. Stamp out spamming. Finger ben@tux.music.asu.edu for PGP 2.3a public key.