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Another source of fraud is those “convenience checks” that the card companies send in the mail. Crooks steal them out of your mailbox and go on their own personal spending sprees. Protect yourself by calling up your credit card company and asking them to stop sending the checks. A locked mailbox is a good idea, too. And though it might sound extreme, buy a good crosscut shredder for your receipts; identity thieves have posed as homeless people, rummaging through trash, looking for bank statements and other sources of personal information.

While you have the credit card company on the phone, have them put a password on your account. This replaces your “mother’s maiden name” and is much more secure. Finally, ask the credit card companies to stop sharing your personal information with other businesses. This will stop some of the junk mail coming into your house, including those “preapproved” credit card offers, which are a primary source of identity theft.

Identity theft is generally hard to prevent because it involves new accounts that crooks open in your name, rather than old accounts for which you have the account numbers. Again, the best way to protect yourself is by getting more information. Both Equifax and TransUnion offer credit-monitoring services. For a monthly fee they’ll watch your credit file and let you know whenever a new account is opened in your name, or when one of your creditors reports that you’re late to make a payment on an already opened account. To notify you, they send an e-mail message that asks you to log in to a password-protected Web site. If you see a suspicious account, you can call up the bank, report the fraud, and try to have the account shut down.

The Equifax service costs $4.95 per month if you want alerts sent within seven days of suspicious activity, $9.95 per month if you want alerts sent within 24 hours. TransUnion charges $10.95 for three months and provides notification within a week. Of course, it is the poor security practices and aggressive sale of credit reports that are largely responsible for the identity theft epidemic in the first place. Still, my advice is to swallow your indignation and sign up for these services.

Finally, don’t click on links in e-mail messages from unknown senders. Thieves are sending out messages that look as if they come from PayPal or eBay, then capturing the usernames and passwords of people who attempt to log in to fake Web pages. Avoid this scam by typing the companies’ Web addresses directly into your browser rather than clicking on links.

Perils abound on the electronic frontier. Taking a few smart precautions will ensure that you don’t have people copping your identity to plunder your bank account and sully your reputation.

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