Now with this, typically, you get a card and also a single tag, keyring type type tag and then also separately. I bought a set of five tags so that I could take a look at them. Take them apart and see how they work. So this is the item on ebay it’s described as a Mifare RC. Five: two two card read antenna: RF module, RFID reader, IC card; a proximity module there, just 3.38 for the kit, which includes the reader writer and the keyring tag and the card free shipping, and this one came from Alice one mono 1983. Now Alice is also selling five tags for one dollar. Fifty, where you can get a hundred smart cards for twenty five dollars: five smart cards for three dollars and so on. So they are very cheap. So I’ve got no hesitation in taking one apart and if I can probably see that I’ve had this one apart before so let’s see. If I can get the cover off not easily, it would seem okay, the covers off. This is the little insert actually and inside you can see there’s a chip with effectively two pins, they’re kind of metal, wings and there’s. A coil of wire let’s get a close up of that magnifying glass, so there’s the chip doesn’t appear to have any markings on it, and the coil of wire is quite neatly wound, not sure how many turns that’s got what we reckon ten or twenty or something Like that now the card is credit card style, it’s extremely thin, hard to believe there’s a coil in here.
But you can find it if you use a torch, so there’s the chip, and you can see the wires coming out to the coil of wire, which runs around the outside, with the chips embedded in the card just there so let’s wire, this up I’ve put seven Wires from the RFID card into this, which is an Arduino Pro Mini now, because this is 3.3 volts, I’ve decided to go for a 3.3 volt Pro Mini that’s, my blue type, but they’re. Generally speaking marked on the back. There are little pads here indicating the voltage and the frequency. This is a 3.3 volt, 8 Meg and I’ve also got one of my USB to serial adapters. Here. This is actually an FTDI one. I probably could have used a CH 340 switch to 3.3 volts, but I thought I’d go for an F TBI today, just for the fun of it. Now. Google search for RC 5 to 2 gives you the datasheet of the chip. This is an xpcom, so we’re sending you’re looking at that Arduino playground, so people have been playing with these readerwriter. Some images they’re an Instructables article on using it for door unlock, which is the general usage of this kind of system it’s for access control. But here we’ve got a library, and this is miguel balboa rfid. Now this is the library that I chose to use to get this thing up and running. So if we click through to that, we get to github and then on here in the readme, which is immediately below the file of the directory listing here, there’s useful stuff like a pin layout.
So you can see how to connect your NFRC 5 to 2 to an uno or a mega or a nano. The uno and the nano pins are very similar for the pro mini they’ve also got Tyler Leonardo there. So you can see here on the reader writer. I’M using 3.3 volts, that’s, VCC or VDD reset, which goes to one of the pins on the Arduino and ground we’ve, got a full SPI implementation. Here is labeled s da s, CK mozzie and MS o, but SP. I generally uses s s rather than s da let’s have a look at Wikipedia on that so here’s Wikipedia on the serial, peripheral interface bus and the diagram over here shows the signals as s clock mazi, MS o, and s s with a bar over it. So it’s active low that’s, the master and the slave. Yes, the names are the same, so this SS is the equivalent of the SD a on the RFID card and in fact, in me, girls notes under this connection table, it does say the SD a pin might be labeled SS on some older m, FR c 5 To 2 boards, while it’s labeled s da on this one, so i’ve wide the RC 5 to 2 to the arduino pro mini as per Miguel’s connection, table I’ve connected the pro mini to the USB to serial converter, using VCC, ground, TX, Rx and DTR for reset And my FTDI board is connected through to my PCs, USB now I’m going to stick this to my monitor, because I want to watch what comes back on the serial monitor in Arduino IDE there’s, not much point this being down on the bench so I’ve installed, Miguel’s Rfid library into my Arduino now this is a brand new sketch today’s date.
So if I go file examples and then come all the way down to the bottom of my monitor, there’s RFID – and here are some of the examples that Miguel has provided and I’m going to start with this one dump info because it’s, so that opens there it’s Kind of the one that gives the most information magazine in this dump info sketch once again, we’ve got the connection information here for SS, otherwise called s da ma, z, ms o and clock also reset and then there’s the sketch itself now it’s, not a very long Sketch, in fact, that’s it I’ve scrolled right to the bottom. I’Ll just come out a bit there it’s a very short sketch, but everything appears to be done in this function, which is the dump to serial and you can’t go and look at dumped serial on github and it’s quite complicated there’s a lot going on in there. But let’s compile this dump to serial this dump info sketch I’ll, just press the compile button. You can see the red and green lights. There are flashing to indicate that the data is going down to the pro mini, so that should be in and running and next I need to click up here to open a serial monitor and then it actually speaks to me and says: M FRC. 5. 2. 2. Software version scan P ICC to see the UID that’s, the unique ID type and data blocks. So now I’ve stopped the reader to my monitor here.
So, if I put one of these cards, I’ll do the card first over there. You can see that immediately. It starts picking up all the data and displaying it on the monitor. So the first thing that this tells me about this card is that it has the unique ID 76 f.3d, 65 now that’s hexadecimal numbering. It also tells me that it’s a my fair one, kilobyte card, otherwise known as a Mifare classic, and then it starts listing out the sectors. Well, there are 16 sectors, it goes from sector 15 down to sector 0. There are 64 blocks, it goes from 63 down to 0 and here’s the actual data. These are bytes, so they’re hexadecimal digit pairs. There are 16 bytes per block and there are four blocks per sector. Ok, let’s. Try let’s try this one that I took apart. If it reads that so yeah once again, here’s the second block – ah now we’ve got some problems, it’s saying timeout in communication and in fact there’s another one of these cards. This tag came with the card as a set with this. Also it reached the UID. You can see the UID scrolling up there. It won’t actually read any data I’m, not quite sure why that is yet. So there is some issue with this tag and the tag that I took apart, but let’s try a tag that does work. Let’S try this one and there’s the data coming up the screen now it’s going to place this tag in front of the reader, but not long enough for it to dump all the data to see what the effect is.
So let’s put it on there and then take it off and it will stop, but what the reason I wanted to do. That was because I wanted to show that the sector 0 down here and block 0. In fact, this is sector 0 and block 0. You can see that the first 4 bytes are 2371 c4a 9 and they happen to be the same as the card UID there’s then some other stuff in that sector 0, but in the sectors above it’s this repeating pattern. In fact, this one, I think, I’ve done some things to it, so it’s slightly different, but you’ll see that in the top is it a sectoral block? I can’t remember, but you get this pattern of six zero zeros. Then this for byte code and then you get six ffs well now it’s time to go to the datasheet, because none of this makes much sense until you start reading the data on the chip so I’m going to start here at n, xpcom and in their search Box I’m going to type our C 5 to 2 and just see what comes up there so here’s a page on the NXP website on the m, FR c 5 to 2 chip and it’s worth reading a little bit of the introduction to this and it’s a Highly integrated reader writer I see for contactless communication at thirteen point, five six megahertz and it supports these my fare cards, but what I really wanted to do is look at the data sheet of one of the actual card chips.
Well, here’s one it’s got a horrible number: the MF 1s 50 X V, one and all that stuff, but it is a Mifare classic. 1K mainstream contactless card smart card – I see, and there is a datasheet, so let’s take a look at that now. Here’S the thing on the memory organization of the chip: it says: it’s a 102 4 by 8 bit a EEPROM organized in 16 sectors of four blocks. One block contains 16 bytes. Now you can see that in the upper block block three of each sector, we’ve got two keys key, a spanning six bits, then some access bits, sorry, six bytes and then key B spanning the upper six bytes. Now, if I scroll down you’ll see that in sector zero block 0 we’ve got this gray bar and it says manufacturer data, and if I go down a little bit further, it says the manufacturer block. This block is programmed and write protected in the production test. So this first block is actually read only and if I go back to my listing on the serial monitor, you can see how, in this block 0, we have the UID in these first four bytes. We then have this manufacturer data. You can’t write to this block here. If I go a little further up, you can seized for here in it, for example, in Sector. Three here are 6 0, 0, so that’s key a and then this ffo 780 69.
These are the access bytes and then the 6 lots of FF is actually key B. So what’s, all this key, a and key B business. Well let’s, look at Wikipedia’s article on the Mifare classic. This is the card that you get. These reader writers says the cards. Fundamentally, just a memory, storage device, memories divided into segments, they are ASIC based and have limited computational power thanks to reliability, low cost, etc. They used for transportation, in other words like rail system, Stadium, ticketing. These are used as access control and tickets for events, so the Mifare classic 1k offers one or two four bytes of data storage split into sixteen sectors. Each sector is protected by two different keys called a and B, and this is where the whole business of encryption comes in. The data in these tags is encrypted so says here. It uses an XP proprietary security protocol called crypto, one for authentication and ciphering and then interesting me down here. It says Mifare classic encryption has been compromised, see below for details and if you click through the links provided, you’ll see this really lengthy document from University. In Netherlands, I presume its students who actually broke the encryption system on the Mifare classic it’s extremely complicated. It goes on forever and ever and ever I did read it it’s quite fun how you would set up your own breaking of this encryption system. I honestly don’t know I didn’t understand much of it to be honest, now also supplied in the examples in this RFID library, something called change UID.
So we should theoretically be to change the user, ID let’s, compile and install that sketch and have a go at that see when these lights start to flash there they go so once that’s in and running, I’ll need to put up the server monitor. Let’S, wait for that to install it’s just verifying now the red light. Okay, let’s go to 0 monitor and try that one out so this one says warning this example overrides the UID of your UID changeable card. Is this EU ID changeable card? Well, it doesn’t appear to be because it’s just doing a dump there, but if I scroll back up it says here, card did not respond to Oh X, that’s, hexadecimal, 40 after Hulk command. Are you sure, it’s a UID, changeable card error, timeout in communication, activating the UID backdoor failed and then it just does a UID listing and a memory dump. So what on earth does all that mean? Okay? Well, I can’t see trying this one called read and write. So let’s load that one in okay, so this one says Stan a Mifare classic P ICC to demonstrate, read and write it’s going to be using the key for a and B of six lots of FF B, where data will be written to the P. I see CPI C C stands for proximity. Integrated circuit card let’s bring one of the tags up. What let’s bring the camera down here, communicating again using key B reading data from block 4? Did this actually do it or not like it did, because in block 4? Here the data is all zeros on this bottom line and it said it read all those zeros.
It then said it was writing data a 1 o 2 O 3 o 4. So this is clearly data that was written in then said: it’s checking the result. The number of bytes that matches 16 success with a smiley face and here in what’s it’s block for we’ve, got that data 1. 2. 3, 4, 5, 6, 7, 8, 9, and then it seems to stop it. Oh well, then it does FF b c d. E. F, what happened? Oh a so this is an interesting device. Um, it kind of works that library seems to work. The hardware works, it can read the cards and the little key ring tags. There. Dcb saw quite a lot of problems with certain tags. They either seem to fail, or maybe I’ve written dated them that has somehow corrupted them in some way. I think the miguel bob our library was the right way to go. This certainly seems to be current. It says here that something was authored 8 days ago and in fact, it’s actually the example so they’re being updated, they’re quite recent, but this is complicated stuff. The data sheet for this MFR c52 to readerwriter chip is 95 pages long. I mean it’s very complicated in terms of all the registers that are inside this chip and the encryption system just adds to that complexity. So this was just a fun first, look at this RFID reader writer, the rc5 and all the tags that come with it, and it is complicated, there’s a lot more work to be done on this.
If I wanted to actually use it for something, but to be honest, I don’t really know what I’d use this. For I mean I got the obvious access control getting in and out of doors and rooms, but I can’t really think what I’d use it for much beyond that.
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Originally posted 2015-12-10 07:38:27.