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A signature. we think there's some sort of legitimacy to signing a receipt. in reality, it's not a good form of security. >> reporter: signature authentication has been replaced by technology. unusual spending patterns and transaction locations are red flags. some retailers say more needs to be done to he prevent fraud and want u.s. credit cards, much like those in europe, to require the use of a p.i.n. >> the reason it's effective is it in theory only you know your p.i.n. even if a credit card is stolen, there's nothing on that card that indicates what the p.i.n. is. >> reporter: the credit c...

We think that we assign value to a signature. we think there's some sort of legitimacy to signing a receipt. in reality, it's not a good form of security. >> reporter: signature authentication has been replaced by technology. unusual spending patterns and transaction locations are red flags. some retailers say more needs to be done to he prevent fraud and want u.s. credit cards, much like those in europe, to require the use of a p.i.n. >> the reason it's effective is it in theory only you know your p.i.n. even if a credit card is stolen, there's nothing on that card that indicates what the p.i...

Signature. >> it's the end of an era. one that few people seem to notice. beginning this month, signatures will no longer be required when using a security chip enabled credit card. phasing out signatures gradually began two years ago when chip technology was introduced. the use of chip cards significantly reduced fraud because they are difficult or counterfeit. many merchants and the credit card industry say signature authentication, which has been used for decades, increased waiting time of the cash register and did little to prevent unauthorized transactions. >> it is somewhat of a traditio...