A lot of guys want to clone their access card, so they buy more mifare 1k card to copy to. But after the package received, what they found is that block 0 of sector 0 can not be modified. The answer is NO to general MIFARE 1K Card.

Meeting RFID - Radio Frequency IDentification, there are a lot of excellent open-source tools and great devices for sniffing and cracking. And mostly, those open-source projects are built for Linux and Windows. In this title I'll introduce the best RFID App, RFID Tools, which supports a lot of libnfc tools on Android Phone.

PN532作为史上最低成本RFID的硬件设备，是无法直接上电工作的，它需要在串口通信下传递数据，因此需要串口模块，那么所有串口通信的模块理论上都支持的，本文里接招制作一个带有USB串口和蓝牙串口的一体式PN532。

在处理许多年份的数据中，遇到需要将查询到的年份进行归类汇总的需求。要求是连续的年份只显示最早与最末的年份，独立没有连续的年份可单独跟随在之前

Day 1

醒的好早，突然想到了做Arduino的点子，上班前就下单了两套微雪电子的e-Paper ESP8266 Driver Board

CRC - Cyclic Redundancy Check is widely used in data transition. According to wikipedia.org, A CRC-enabled device calculates a short, fixed-length binary sequence, known as the check value or CRC, for each block of data to be sent or stored and appends it to the data, forming a codeword.

在之前遇到的数据中，由于同一部件的可替换不同产品，造成了同一行出现了2次及以上同样的字段和属性值，而只需要其中的一个以及对应值即可，此文记录下处理的过程。