MIFARE ® DESFire EV1 is based on a global standard for both RF interfaces and encryption methods. The card is fully compliant with ISO / IEC 14443A and can be adapted to comply with ISO IEC 7816-4 Commands. The encryption method is AES 128. DESFire EV1 can handle up to 28 different applications and 32 files per application. The size of files is determined when created, making the DESFire EV1 a very flexible card with multiple applications and high security.