Kevin Kelleher leads marketing for Return Path Consumer Insight line of business. He helps people see how data can be used to make smarter decisions. In his spare time, Kevin enjoys running, reading and fencing.

Phishing is but one attack vector for which retailers must be on the lookout. It's important to note that although the financial sector is a fan favorite of phishers, it's by no means the only target. Today, medical records stored at hospitals, clinics and insurance companies are being stolen and sold just like bank information. In fact, last year the going rate for medical records was up to 10 times higher than that of financial information. And although it likely won't ever produce thrilling stories like those of Dillinger or Bonnie and Clyde, phishing is one of the easiest, cheapest and most effective means of theft today.

These days, anyone can sell online and make significant profits. During the budding years of e-commerce, online selling was dominated by large retail corporations with the resources to sell (and ship) far and wide. But new technologies and platforms (think Etsy and Shopify) are giving independent e-tailers the resources, tools and momentum they need to push their bigger counterparts out of the way.

The 2010 holiday shopping season could be the most costly ever for internet retailers. According to industry data, web fraud, including the use of stolen credit cards to make purchases, is costing retailers over $3 billion every year. Reversing the trend is difficult, as criminals are clever and quickly find new ways around retailer fraud prevention tactics. So what can retailers do this holiday season to protect themselves? Here are four tips to keep in mind:

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