公开(公告)号：US20110253788A1

公开(公告)日：2011-10-20

申请号：US13087562

申请日：2011-04-15

Applicant: Andrew Campbell ,  Brian Docherty ,  James Churchman ,  Kevin Maidment ,  Nick McGarvey

Inventor： Andrew Campbell ,  Brian Docherty ,  James Churchman ,  Kevin Maidment ,  Nick McGarvey

IPC: G06K7/06

CPC classification number: G06K7/0013 ,  G06K7/0008 ,  H05K1/0219 ,  H05K1/0275 ,  H05K2201/09263 ,  H05K2201/10204

Abstract: The present invention detects the current flowing through the contacts of the smart card reader due to the presence of a “shim”. Small value resistors are connected in series with either the Power connection or the Ground connection, or both. Values are typically 47 milliohms to 100 milliohms. The use of such small values ensures that little voltage is dropped across the resistors and that the card is therefore adequately powered. With no card present, the current through these resistors should be zero and therefore the voltage across the resistors will also be zero. Amplifier circuits are employed to monitor and amplify the voltage across the resistors and in the “PayPod” design the amplifier outputs are connected to analogue to digital inputs on the microprocessor. Where the microprocessor (or other processing electronics) used has no analogue to digital inputs, separate analogue to digital circuits may be used. The microprocessor may then monitor the current flowing into the power supply contacts of the card reader.

Abstract translation: 本发明由于存在“垫片”而检测流过智能卡读卡器的触头的电流。 小值电阻器与电源连接或接地连接或两者连接。 值通常为47毫欧至100毫欧。 使用这样小的值确保电阻器上的电压几乎没有下降，因此卡片被充分供电。 没有存在卡，通过这些电阻的电流应为零，因此电阻两端的电压也将为零。 采用放大器电路来监视和放大电阻两端的电压，而在“PayPod”设计中，放大器输出端连接到微处理器上的模拟数字输入端。 在使用微处理器（或其他处理电子设备）没有模数转换器的情况下，可以使用单独的模数转换电路。 然后，微处理器可以监测流入读卡器的电源触点的电流。

公开(公告)号：US20110253782A1

公开(公告)日：2011-10-20

申请号：US13087603

申请日：2011-04-15

Applicant: Andrew Campbell ,  Brian Docherty ,  James Churchman ,  Kevin Maidment ,  Nick McGarvey

Inventor： Andrew Campbell ,  Brian Docherty ,  James Churchman ,  Kevin Maidment ,  Nick McGarvey

IPC: G06K7/00

CPC classification number: G06K7/0013 ,  G06K7/0008 ,  H05K1/0219 ,  H05K1/0275 ,  H05K2201/09263 ,  H05K2201/10204

Abstract: Dummy data wires or PCB tracks are employed that run close to and parallel with the wires or tracks that carry the actual data between the card and the microprocessor. These dummy data tracks or wires are driven with dummy random data at a similar data rate to that used on the real data track(s) or wire(s). As the dummy tracks or wires are close to the “real” data tracks or wires and the dummy data is random, attempts to capacitively sense the actual data will be disrupted. To counter this method of detection the dummy data track may be connected to loads (resistive, capacitive or both) to ensure that current flows when dummy data is applied to the tracks. The loads may be selected such that the current flows are similar to those in the real data track. This is achieved by determining the terminating impedances on the real data track and using similar values on the dummy data tracks. Or, the strategy may be to ensure that the current flow in the dummy data tracks are much higher than the real data track current, in which case the total magnetic field will be dominated by the dummy data and the “real” signal will be “drowned out” by the dummy data signals.

Abstract translation: 采用虚拟数据线或PCB轨迹，其接近并与导线或跟踪平行，这些导线或轨道承载卡和微处理器之间的实际数据。 这些虚拟数据轨道或导线以与实际数据轨道或线路上使用的相似数据速率的虚拟随机数据驱动。 由于虚拟轨道或导线靠近“实际”数据轨道或导线，并且虚拟数据是随机的，所以试图电容性地感测实际数据将被破坏。 为了对这种检测方法，虚拟数据磁道可以连接到负载（电阻，电容或两者），以确保当虚拟数据被应用于磁道时电流流动。 可以选择负载，使得电流与实际数据轨道中的相似。 这是通过确定实际数据轨道上的端接阻抗并在虚拟数据轨道上使用相似的值来实现的。 或者，策略可能是确保虚拟数据磁道中的当前流量远高于实际数据磁道电流，在这种情况下，总磁场将由虚拟数据支配，“真实”信号将为“ 淹没“的虚拟数据信号。

公开(公告)号：US20110255253A1

公开(公告)日：2011-10-20

申请号：US13087538

申请日：2011-04-15

Applicant: Andrew Campbell ,  Brian Docherty ,  James Churchman ,  Kevin Maidment ,  Nick McGarvey

Inventor： Andrew Campbell ,  Brian Docherty ,  James Churchman ,  Kevin Maidment ,  Nick McGarvey

IPC: H05K5/00 ,  H05K1/16

CPC classification number: H05K1/0275 ,  H05K2201/09263

Abstract: A multi-layer Printed Circuit Board (PCB) holds a number of sections of serpentine track on two or more internal layers of a multi-layer PCB. The sections are connected in series with resistors between each section. One end of each of the resistors a connection to an analogue to digital converter is made. In its simplest form, each of the serpentine track is produced on a separate internal layer of the PCB. The outer layers are typically ground planes. Attempts to drill through the PCB are likely to short the ground plane to one or more of the internal serpentine tracks, which will alter the voltages on the analogue to digital connections. Shorting out sections of serpentine track with a view to then drilling through undetected are made very difficult in this scheme since shorting any tack to the ground plane or any track to any other track or breaking any track will be detected by changes to the voltages on the connections to the analogue to digital converter inputs.

Abstract translation: 多层印刷电路板（PCB）在多层PCB的两个或多个内层上保留了许多部分蛇形磁道。 这些部分与每个部分之间的电阻串联。 制造每个电阻器的一端与模数转换器的连接。 在其最简单的形式中，每个蛇形轨迹在PCB的单独内部层上产生。 外层通常是接地层。 在PCB上钻孔的尝试可能会将接地平面缩短到一个或多个内部蛇形轨道，这将改变模拟到数字连接的电压。 在这种方案中，短路部分的蛇形轨道是非常困难的，因为短路到地面或任何轨道到任何其他轨道或任何轨道的任何轨道将被检测到， 连接到模数转换器输入。

公开(公告)号：US20110253786A1

公开(公告)日：2011-10-20

申请号：US13087580

申请日：2011-04-15

Applicant: Andrew Campbell ,  Brian Docherty ,  James Churchman ,  Kevin Maidment ,  Nick McGarvey

Inventor： Andrew Campbell ,  Brian Docherty ,  James Churchman ,  Kevin Maidment ,  Nick McGarvey

IPC: G06K7/01

CPC classification number: G06K7/0013 ,  G06K7/0008 ,  H05K1/0219 ,  H05K1/0275 ,  H05K2201/09263 ,  H05K2201/10204

Abstract: A card reader terminal is provided with circuitry to detect wireless transmission of data from the card terminal from illicit transmitting equipment within the terminal in the form of a “shim” or otherwise. The detector circuit is connected to an A/D input of a microprocessor. Voltage level at the input may be measured rather than just treating it as digital input where the voltage level would be taken by the processor as either ON (signal present) or OFF (signal not present). Where the microprocessor (or other processing electronics) used does not have an analog to digital converter input, an external analog to digital circuit may be used. The terminal can determine the level of radio signal activity in its vicinity before a card is entered into the card slot, the level after the card is inserted and the level during the time the terminal is exchanging data with the card. If there is an abrupt increase in signal level when the card is inserted or when data exchange commences, the processor can ensure that the PIN is not sent to the card and can prevent all further transactions until the radio signal is no longer present.

Abstract translation: 读卡器终端设置有电路，用于以“垫片”或其他形式检测来自卡终端的数据从终端内的非法传送设备的无线传输。 检测器电路连接到微处理器的A / D输入。 可以测量输入端的电压电平，而不是将其视为数字输入，其中处理器将采取电压电平为ON（信号存在）或OFF（信号不存在）。 在使用微处理器（或其他处理电子设备）没有模数转换器输入的情况下，可以使用外部模拟数字电路。 在卡插入卡槽之前，终端可以确定其附近的无线电信号活动的水平，卡插入后的电平以及终端与卡交换数据期间的电平。 如果在插入卡或数据交换开始时信号电平突然增加，则处理器可以确保PIN不发送到卡，并且可以防止所有进一步的事务，直到无线电信号不再存在。