Steve Schear wrote: | I've been charged with developing an Internet service which needs to assure | its clients of anonymity. However, we fear some clients may abuse the | service and we wish to prevent the abusers from re-enrollment if | terminated for misbehavior. (In your example, it would be the person(s) | trying to discover the service host via flood). Why not have a high sign up fee or deposit? Let people play games, and pay for it. Trying to build morality into a crypto system is tough. Its easier to move the costs up front. Let those who want to pay the deposit fee repeatedly do so. Think of it as a tax refund. :) Adam -- "Every year the Republicans campaign like Libertarians, and then go to Wasthington and spend like Democrats." Vote Harry Browne for President. http://www.harrybrowne96.org