7816 interface circuit of contact type intelligent card

Abstract

The invention discloses a 7816 interface circuit of a contact type intelligent card. The circuit comprises a voltage following circuit and a filtering circuit; the input end of the voltage following circuit is connected with a clock signal line of an 7816 interface in the CPU end of a card reader; the input end of the filtering circuit is connected with the output end of the voltage following circuit, and the output end of the filtering circuit is connected with the 7816 interface of the contact type intelligent card; and clock signals are emitted by the card reader, pass the voltage following circuit and the filtering circuit, and then reach the 7816 interface of the contact type intelligent card. According to the invention, the phenomenon of signal overshooting in the clock signal line of the 7816 interface of the intelligent card can be removed effectively.

Description

technical field [0001] The invention relates to the field of smart card security, in particular to a contact smart card 7816 interface circuit. Background technique [0002] Cryptanalysis is an important branch of cryptography. Typical cryptanalysis usually does not consider the specific implementation of the cryptosystem, but only discovers the key information in the cryptosystem through mathematical reasoning, statistical analysis, high-performance computing, and provable security. These analysis methods mainly include differential analysis, linear analysis, correlation key analysis, algebraic analysis, linear approximation, difficult problem solving, reduction proof, etc. In practice, cryptographic systems are usually implemented with hardware or software in the form of hardware, such as smart cards, RFID, cryptographic coprocessors, SoC cryptographic chips, and cryptographic machines. In the implementation environment of these cryptographic systems, attackers can not on...

AI Technical Summary

Problems solved by technology

[0004] The communication interface of the contact smart card is the 7816 interface. In the process of collecting the power consumption of the contact smart card, it is found that the clock signal on the clock signal line of the 7816 interface will produce signal overshoot at the rising and falling edges. Overshoot does not affect communication, but it will generate interference signals to the system, especially when the clock frequency of the 7816 interface is accelerated, the interference signals generated are more obvious, and these additional interference signals bring difficulties to power consumption analysis

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