After 6 weeks of number crunching, I've finally produced a new set of bitslice DES S-boxes using non-standard logic gates. Numbers are as follows - S1 S2 S3 S4 S5 S6 S7 S8 Avg 56 50 53 39 56 53 51 50 51 Details at http://www.cs.mu.oz.au/~mkwan/bitslice There won't be any more improvements in the foreseeable future, since I've run out of ideas. Feel free to use this code in the RSA DES II challenge, but remember to give credit where it's due. mkwan