By verifying(证实)that the signal matches the card details,the server can establish that the user is not simply keying in a credit card number but actually has the card to hand.The ID code changes each time the card is used in a preordered sequence that only the server knows.
This prevents fraudsters recording the beeps,noting the card details and then playing back the audible ID when they key in the details later But this earlier technology cannot prevent fraudulent use of stolen cards The new one can.The new voice card also identifies itself by its ID squawk.but it will not do this until it has verified the legitimate(合法的)users spoken password Thieves will be unable to use the card because even if they knew the password they would have to be able to copy the owners voice with a high degree of accuracy.
The challenge for Beepcard has been to develop voice-recognition and audio circuitry that Can be powered by a mini battery embedded(嵌入的)in a credit card.To maximize battery life,the electronics are only switched on when the card is being used.Pressing a button on the cards surface prompts it to utter Say your password in female voice If the voicerecognition software proves that the password is authentic(真实的),it sends its ID squawk which the server then identifies.allowing the transaction to proceed.
36 The voice credit card is an important invention because
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