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Related topics: identity theft, financial privacy, credit card, fraud, retail

Planning a shopping trip? Be careful: Crime goes up in a down economy, and credit and debit card users are often the victims.

Here are a few ways to better protect your wallet:

Shop the big names

With countless retailers and payment processors having reporting breached customer data in recent years, it's no surprise that consumers look for certified safety seals such as VeriSign and Trust Guard on retail websites. But researchers say not all certification programs can ensure that retailers will follow security or privacy guidelines.

Phil Hochmuth, a senior analyst at research firm Yankee Group, which did a study on such seals, cites an "overall lack of a generally accepted standard" of what they mean. "That's the nature of the Internet," he says.

Experts agree: Stick with big, national companies such as Amazon.com, which have stronger security because "they have the most to lose," Hochmuth says.

Find some privacy

"Shoulder-surfing" is one way thieves can strike at ATMs and computers. Cellphone owners may be even more vulnerable to nosy neighbors, because they tend to type more slowly on their handhelds and use them everywhere, says Tal Garfinkel, a scientist at VMware who develops security technologies. For $3 to $10, e-tailers such as Overstock.com sell filters that darken phone screens when viewed from an angle.

Use the right card

If bogus charges were made on your credit card, you're not liable for them while they're being investigated. But banks can take up to two weeks before restoring debit card funds to your account. Plus victims could be liable for up to $500 in losses if they wait more than three days to report a problem or far more if they wait longer; credit cards cap losses at $50.

To be truly safe, "never use debit cards," says Paul Stephens, a director at the Privacy Rights Clearinghouse, a consumer group.

This article was reported by Neil Parmer for SmartMoney.