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Hitag2AES:

Covered transponder family: PCF7939MA itself and it’s MCU based derivatives - e.g. PCF7x41MTT, PCF7x61MTT, PCF7953MTT. Used by Renault, Dacia.

Security is based on 128-bit AES key, there are 512 bytes of EEPROM memory where additional data are stored. XMA (extended memory access) is based on similar principles like HitagPro and Hitag2extended - 8 pages with individual access rights.

Blank chip must be configured first to grant XMA access.