MIFARE Ultralight

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More general info on the MIFARE page.

There is a version with 3DES authentication called MIFARE Ultralight C.

Ultralight has a 64 byte EEPROM of which the final 48 bytes are for application data.

Sample tags proviced with the Touchatag (aka Tikitag) are Ultralight tags.

NFC Forum Type 2 Tag

From NFC Forum: Type 2 Tag is based on ISO/IEC 14443A. Tags are read and re-write capable; users can configure the tag to become read-only. Memory availability is 48 bytes and expandable to 2 kbyte.
NXP AN1303 (pdf) describes how to use an Ultralight or MIFARE Ultralight C as Type 2 Tag.

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