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Quote:While the reputation systems used by the buyers and sellers of stolen credit cards differ from those used by law-abiding vendors, any business built on trust can be destabilized when trust is undermined. The paper proposes two ways to do just that: a Sybil attack and a slander attack.

A Sybil attack, named after the pseudonym of a woman known for her multiple personalities, involves creating multiple online identities as a merchant of stolen data. These identities could be used to undermine confidence in the market by repeatedly failing to deliver data paid for by those seeking to commit credit card fraud.

A slander attack aims to impugn the reputation of established dealers in illicit data to depress prices and drive customers to less-reputable dealers, who may defraud those aiming to commit fraud and further destabilize the black market...