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By Nandita Bose CHICAGO (Reuters) - New technology about to be deployed by credit card companies will require U.S. consumers to carry a new kind of card and retailers across the nation to upgrade payment terminals. Credit card companies have set an October deadline for the switch to chip-enabled cards, which come with embedded computer chips that make them far more difficult to clone. Counterfeit cards, however, account for only about 37 percent of credit card fraud, and the new technology will be nearly as vulnerable to other kinds of hacking and cyber attacks as current swipe-card systems, security experts say. Moreover, U.S. banks and card companies will not issue personal identification numbers (PINs) with the new credit cards, an additional security measure that would render stolen or lost cards virtually useless when making in-person purchases at a retail outlet.