Can I write or modify data on an RFID tag

Question

maybe my question would be lost in the forum  but has somebody work with RFID tags  I know I can read them  but can I write or modify the inside data  Does anyone know where can I find more about this

User · Answer

We have recently started looking into RFID solutions at my work place and we found a cheap solution for testing purposes.

One of the units from here:

http://www.sdid.com/products.shtml

Plugs into any windows mobile device with an SD slot and allows reading / writing. There is also a development kit to get you on your way with your own apps.

Hope this helps

User · Answer

RFID Standards      125 Khz  low-frequency  tags are write-once read-many  and usually only contain a small   permanent  unique identification number  13 56 Mhz  high-frequency  tags are usually read write  they can typically store about 1 to 2 kilbytes of data in addition to their preset  permanent  unique ID number  860-960 Mhz  ultra-high-frequency  tags are typically read write and can have much larger information storage capacity  I think that 64 KB is the highest currently available for passive tags  in addition to their preset  permanent  unique ID number     More Information   Most read write tags can be locked to prevent further writing to specific data-blocks in the tag s internal memory  while leaving other blocks unlocked  Different tag manufacturers make their tags differently  though   Depending on your intended application  you might have to program your own microcontroller to interface with an embedded RFID read write module using a manufacturer-specific protocol   That s certainly a lot cheaper than buying a complete RFID read write unit  as they can cost several thousand dollars   With a custom solution  you can build you own unit that does specifically what you want for as little as  200    Links    RFID Journal  RFID Toys  Book  Website  SkyTek - RFID reader manufacturing company  you can buy their products through third-party retailers  amp  wholesalers like Mouser   Trossen Robotics - You can buy RFID tags and readers  125 Khz  amp  13 56 Mhz  from here  among other things

User · Answer

It depends on the type of chip you are using  but nowerdays most chips you can write  It also depends on how much power you give your RFID device  To read you dont need allot of power and very little line of sight  To right you need them full insight and longer insight

User · Answer

Some RFID chips are read-write  the majority are read-only   You can find out if your chip is read-only by checking the datasheet

User · Answer

I did some development with Mifare Classic  ISO 14443A  cards about 7-8 years ago  You can read and write to all sectors of the card  IIRC the only data you can t change is the serial number  Back then we used a proprietary library from Philips Semiconductors  The command interface to the card was quite alike the ISO 7816-4  used with standard Smart Cards    I d recomment that you look at the OpenPCD platform if you are into development   This is also of interest regarding the cryptographic functions in some RFID cards

User · Answer

It depends on the type of chip you are using  but nowerdays most chips you can write  It also depends on how much power you give your RFID device  To read you dont need allot of power and very little line of sight  To right you need them full insight and longer insight

User · Answer

Some RFID chips are read-write  the majority are read-only   You can find out if your chip is read-only by checking the datasheet

User · Answer

Some RFID chips are read-write  the majority are read-only   You can find out if your chip is read-only by checking the datasheet

User · Answer

RFID tag has more standards  I have developed the RFID tag on Mifare card  ISO 14443A B  and ISO 15693  Both of them  you can read write or modify the data in the block data of RFID tag

User · Answer

I did some development with Mifare Classic  ISO 14443A  cards about 7-8 years ago  You can read and write to all sectors of the card  IIRC the only data you can t change is the serial number  Back then we used a proprietary library from Philips Semiconductors  The command interface to the card was quite alike the ISO 7816-4  used with standard Smart Cards    I d recomment that you look at the OpenPCD platform if you are into development   This is also of interest regarding the cryptographic functions in some RFID cards

User · Answer

I did some development with Mifare Classic  ISO 14443A  cards about 7-8 years ago  You can read and write to all sectors of the card  IIRC the only data you can t change is the serial number  Back then we used a proprietary library from Philips Semiconductors  The command interface to the card was quite alike the ISO 7816-4  used with standard Smart Cards    I d recomment that you look at the OpenPCD platform if you are into development   This is also of interest regarding the cryptographic functions in some RFID cards

User · Answer

RFID Standards      125 Khz  low-frequency  tags are write-once read-many  and usually only contain a small   permanent  unique identification number  13 56 Mhz  high-frequency  tags are usually read write  they can typically store about 1 to 2 kilbytes of data in addition to their preset  permanent  unique ID number  860-960 Mhz  ultra-high-frequency  tags are typically read write and can have much larger information storage capacity  I think that 64 KB is the highest currently available for passive tags  in addition to their preset  permanent  unique ID number     More Information   Most read write tags can be locked to prevent further writing to specific data-blocks in the tag s internal memory  while leaving other blocks unlocked  Different tag manufacturers make their tags differently  though   Depending on your intended application  you might have to program your own microcontroller to interface with an embedded RFID read write module using a manufacturer-specific protocol   That s certainly a lot cheaper than buying a complete RFID read write unit  as they can cost several thousand dollars   With a custom solution  you can build you own unit that does specifically what you want for as little as  200    Links    RFID Journal  RFID Toys  Book  Website  SkyTek - RFID reader manufacturing company  you can buy their products through third-party retailers  amp  wholesalers like Mouser   Trossen Robotics - You can buy RFID tags and readers  125 Khz  amp  13 56 Mhz  from here  among other things

User · Answer

We have recently started looking into RFID solutions at my work place and we found a cheap solution for testing purposes.

One of the units from here:

http://www.sdid.com/products.shtml

Plugs into any windows mobile device with an SD slot and allows reading / writing. There is also a development kit to get you on your way with your own apps.

Hope this helps

User · Answer

RFID tag has more standards  I have developed the RFID tag on Mifare card  ISO 14443A B  and ISO 15693  Both of them  you can read write or modify the data in the block data of RFID tag

User · Answer

Some RFID chips are read-write  the majority are read-only   You can find out if your chip is read-only by checking the datasheet

User · Answer

I did some development with Mifare Classic  ISO 14443A  cards about 7-8 years ago  You can read and write to all sectors of the card  IIRC the only data you can t change is the serial number  Back then we used a proprietary library from Philips Semiconductors  The command interface to the card was quite alike the ISO 7816-4  used with standard Smart Cards    I d recomment that you look at the OpenPCD platform if you are into development   This is also of interest regarding the cryptographic functions in some RFID cards

[hardware] Can I write or modify data on an RFID tag?

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