Compared with IC card, contactless IC card has several more problems as it has to be passive, contactless and anti-collision.
较之于ic卡，非接触式IC卡还需要解决无源、免接触和防冲突几个问题。
The invention can prevent the passive sign device as IC card to be unauthorized dispatched which is not aware of user to confirm the control of user on the sign.
本发明能够防止被动签名设备，如ic卡等在用户毫无察觉的情况下被未经授权地多次调用，从而保证用户对签名的控制。
The invention can prevent the passive sign device as IC card to be unauthorized dispatched which is not aware of user to confirm the control of user on the sign.
本发明能够防止被动签名设备，如ic卡等在用户毫无察觉的情况下被未经授权地多次调用，从而保证用户对签名的控制。
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