Title: Curbing Spam with Cryptography Author: Kjell Wooding, University of Calgary Abstract: It has long been recognized that digital signatures on electronic mail would go a long way towards solving the problem of unsolicited commercial email (spam). Unfortunately, deployment of digital signature schemes usually require significant investment in both certificate infrastructures, and user education. A different proposal for curbing spam requires an email sender to compute a mathematically intensive proof-of-work function before a message will be accepted by a recipient. This talk will describe a combined scheme that makes use of both of these techniques. In other words, a digital signature scheme aimed squarely at attacking the spam problem.