Journal of Network and Computer Applications
A survey of emerging approaches to spam filtering
ACM Computing Surveys (CSUR)
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We present here a method and a system that implements an unsolicited commercial e-mail (also known as UCE or SPAM) countermeasure. Our method is based on distributed access lists and a challenge-response protocol where challenges are computationally complex problems. These challenges require the spammer to consume finite computational resources as a prerequisite for the delivery of an unsolicited message. We produce an economic analysis to demonstrate the capability of our method to disrupt the profitability of spam.