Target Black Friday 2013 Fraud Update: Target customers have until April 23  to register for Target credit monitoring in the wake of the Black Friday data breach of 2013. The warning comes on the tail of a study finding that the Target Black Friday breaches did not  change shopper behavior.

Ever since the data breach, Target has been offering free credit monitoring. Target shoppers are worried about the breach, but are doing nothing to make sure their data is more secure.

Beau Biden, the Attorney General Beau Biden of Delaware, is urging people in his state who shopped at Target to register for free credit monitoring. Biden said "Target is doing the responsible thing by offering free credit monitoring to all of its customers and I encourage consumers to take advantage of this service immediately."

As many as 70 million Target shoppers who made credit or debit card purchases from Nov. 27, 2013 to Dec. 15, 2013 could have had their information compromised. Hackers could have taken their name, credit or debit card number, the card's expiration date, and the card's three-digit CVV security code. Target said it is helping an ongoing investigation.

A new Associated Press--GfK Poll found that consumers are worried about the Black Friday Target hacking but haven't changed their behavior.

The survey found that almost half of Americans say they are extremely concerned about the breach. Sixty-one percent say they are deeply worried about pending online. 62 percent of people surveyed said they are very concerned when they make purchases through mobile devices. On 37 percent have tried to use cash for purchases instead of credit cards. 41 percent have checked their credit reports. Few have changed online passwords at retailers' websites or requested new credit or debit card numbers.

Target is offering free credit monitoring services for a year to all its customers. Customers must sign up to receive an activation code on creditmonitoring.target.com by April 23, and must redeem their code by April 30.