: T[i] is generated by a pseudo random process, similar to shuffling a deck of : cards. For each i, fill the vector with the values 0 to D-1. Then two random : indexes (j & k) are chosen (to be different) and the two values at : T[i,j] and T[i,k] are swapped. This can be iterated an arbitraty number of : times (L) to ensure a good "shuffle" of the values. I saw this particularly clueless statement and stopped even trying to follow the rest of it. Still, I made an even more stupid blunder on sci.crypt a few weeks ago myself, so I can't criticise. All I can say is I learned from my mistake and will leave thinking up new crypto schemes to the experts. G