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sunebeck

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This is supposed to be contrasted with an operator asking for the credit card digits manually, leaving room for them to scribble down the card number.

The DTMF system is so that the computer receives the card number directly. Of course that could be done with speech recognition as well.

And in any case, as others have pointed out, a phone connection is not a secured line.

But then again, a credit card fraud incident isn't the end of the world either. So maybe the risk is acceptable.

It is not difficult to make a passport reader, and the Chinese are definitely capable of that.

You can read the contents of the RFID chip using $100 off-the-shelf hardware, and the decryption key is the OCR string on the “main” page of the passport.

The piece of glass where you lay the passport, the OCR, and the case itself I’m sure any Chinese contractor could easily do as well.