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Smart card security
The security of a smart card system consists of the front-end enforcement, front-end and back-end verification, back-end audit and system fraud damage control. Security is addressed at the system level.
Technically Mifare cards can be emulated. However if the system security design is correct, fraud is only possible with a collaborating cardholder or merchant. It is improbable that a merchant would accept a payment with the cardholder carrying a big emulator to pay for the transaction.
==Differential power analysis==
Differential power analysis
involves measuring the precise time and electric current required for certain encryption or decryption operations. From these measurements, an attacker can deduce the on-chip private key used by public key algorithms such as RSA. Some implementations of symmetric ciphers can be vulnerable to timing or power attacks as well.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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