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Differential Miller coding and decoding methods and devices for near field communication system

A technology of Miller coding and coding method, which is applied in the field of near-field communication and can solve problems such as data tampering

Inactive Publication Date: 2010-06-16
爱思开电讯投资(中国)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Therefore, for the modified Miller encoding method, the attacker still has a 25% chance of data tampering

Method used

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  • Differential Miller coding and decoding methods and devices for near field communication system
  • Differential Miller coding and decoding methods and devices for near field communication system
  • Differential Miller coding and decoding methods and devices for near field communication system

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Embodiment Construction

[0060] The present invention will be described below through specific embodiments in conjunction with the accompanying drawings. It should be noted that the present invention is not limited to the embodiments described below.

[0061] after analysis figure 2 , image 3 , Figure 4 , it is not difficult to find that there are only two methods used by attackers: one is to tamper with a low level into a high level (for Manchester encoding of 10% ASK), and the other is to fill the gap, that is, to actually Zero level tampered to high level (modified Miller coding for 100% ASK). In short, the attacker can only change the amplitude of the signal from low to high, but not from high to low.

[0062] Based on this understanding, the inventor draws on the advantages of the above two codes and avoids the disadvantages, and provides another different encoding method, which we call the differential Miller encoding method with 100% amplitude modulation. Using the differential Miller co...

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Abstract

The invention relates to differential Miller coding and decoding methods and differential Miller coding and decoding devices for a near field communication (NFC) system. The differential Miller coding method comprises: judging whether a current bit is of a first kind or a second kind; if the current bit is of the first kind, generating a current waveform different from a previous waveform; and if the current bit is of the second kind, generating a current waveform like the previous waveform, wherein the current waveform and the previous waveform both have a spatial interval and the spatial intervals of the current waveform and the previous waveform are at different positions when the current waveform and the previous waveform are different. Therefore, the coding device only judges whether the current bit is of the first kind or the second kind and can determine the waveform to be used to represent the current bit according to the judgment result. Similarly, the decoding device can perform decoding by simply comparing previous and current waveforms. As a result, coding and decoding can be performed quickly and simply and data are unlikely to be tampered by an attacker.

Description

technical field [0001] In general, the present invention relates to the field of near field communication (NFC), and in particular, the present invention relates to a differential Miller encoding method and apparatus and a differential Miller decoding method and apparatus for a near field communication (NFC) system. Background technique [0002] Near Field Communication (NFC) technology is a radio frequency identification (RFID) technology commonly used in contactless short-range wireless communication, which enables mobile devices, consumer electronics, personal computers, and smart control tools within a very short distance communication between. NFC technology has a relatively high communication rate and communication establishment speed, and provides a simple, touch-sensitive solution that enables users to exchange information, access content and services simply and intuitively. For more information on NFC, visit the NFC Forum's website at URL: http: / / www.nfc_forum.org....

Claims

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Application Information

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IPC IPC(8): H03M5/14G06K7/00H04L1/00
Inventor 张维华金亨一罗栋元李相研
Owner 爱思开电讯投资(中国)有限公司