MIFARE® is currently the most widely used system and was sold 10 billion times according to the manufacturer. MIFARE® is an acronym and stands for the Mikron Fare Collection System, as it was actually used for monthly public transport tickets.
13.56 MHz NFC chipsets
These chipsets are licensed by the market leader NXP Semiconductors. The frequency 13.56 MHz is based on NFC and therefore support NFC support Android smartphones. The chipsets differ essentially in the encryption algorithm and storage capacity.
MIFARE Classic® 1K and 4K: AES encryption, however, already ISO 14443A.
MIFARE Ultralight®: Similar to MIFARE Classic®, but without cryptography. Corresponds to the Type 2 tag specification for NFC tags.
MIFARE Ultralight® C: Similar to Mifare Classic® but with 3DES algorithm. Corresponds to the Type 2 tag specification for NFC tags. Used for our NFC implants as NTAG 216 version.
MIFARE Plus S®: MIFARE Classic® migration project. Can be used as MIFARE Classic® during the migration phase and provides AES-128 encryption.
MIFARE DESFire®: microcontroller based, 3DES and AES-128 encryption. Memory can be freely personalized using NFC tools such as MIFARE Ultralight® C.
MIFARE Classic® 1k and 4k
The memory of a MIFARE Classic® chipset is divided into several sectors. The sectors in turn are divided into several blocks of 16 bytes. The last of these blocks in each sector is called a trailer and contains two keys and the access rights for each sector.
|MIFARE Classic® 1K
||MIFARE Classic® 4K
MIFARE Ultralight® C is used by us and corresponds to the MIFARE Classic® with the difference that this chipset can only be described by very few smartphones. MIFARE Ultralight® C, on the other hand, can be described by all NFC enabled smartphones and uses a 3DES encryption method.
MIFARE Classic® uses a very weak encryption and is therefore not suitable for payment systems or the like. Nevertheless, MIFARE Classic® chipsets such. B. transponder cards often used for access control or tickets. This chipset has a larger memory than other chipsets (1kb-4kb) of the MIFARE® family. Unfortunately, this can only be described by few smartphones.
MIFARE DESfire® / MIFARE DESfire® EV1 is often used for safety-related applications. MIFARE® DESFire® is very commonly used for NFC payment methods or for opening NFC door locks, as the EV1 version uses very secure AES encryption. The storage capacity is available in similar sizes as MIFARE Ultralight®.
Memory blocks in NFC implants
Chipsets such as MIFARE Ultralight® C or MIFARE® DESFire® use EEPROM memory, which NTX calls NXP. These memories can be password protected (32bit) and have a UID (serial number).
- NTAG 210: ISO/IEC14443 Type A, NFC Forum Type2 48 bytes
- NTAG 212: ISO/IEC14443 Type A, NFC Forum Type2 128 bytes
- NTAG 213: ISO/IEC14443 Type A, NFC Forum Type2 144 bytes
- NTAG 215: ISO/IEC14443 Type A, NFC Forum Type2 504 bytes
- NTAG 216: ISO/IEC14443 Type A, NFC Forum Type2 888 bytes
So if a description of type 2 is mentioned without a word from NTAG, then all NTAG2x are supported. If no type but the MIFARE® variants are listed, you can easily adjust them with the transponder without paying attention to NTAG special features.
124 kHz implants are the first to conquer the RFID market. These chipsets can be found as a price tag on clothing or as an animal chip in a pet. This chipstz has no encryption or memory block. Anyway, no writable us known. The block already described contains only the UID sufficient to identify itself. But here caution is required, the chip can not be replaced by a password. For reasons of compatibility, it is recommended to add an NFC, ie 13.56 MHz implant, as this technology is trend-setting and can control several terminal devices.
Security of different chipsets
Some of these MIFARE® chips can be encrypted. Two different types are possible: 3DES algorithm and AES128 bit. The 3DES (pronounced tripple DES) has a bit length of 56 and thus the weaker of the two. It should be noted, however, that an NFC implant also uses the 3DES, but a 56 bit key say 256 = about 72 quadrillion different options for data that you want to finally share as sufficiently safe felt.