- Ev1 – static deformation modulus or strain modulus of the first loading cycle for the bearing capacity.
- Ev2 – static deformation modulus or strain modulus of the second loading cycle for the bearing capacity.
- The ratio Ev2/Ev1 is a figure for the compaction level.
Firstly MIFARE cards arrived in 1994 as a product of NXP and have since undergone several upgrades to ensure they remain as secure as possible. The DESFire contactless range was originally introduced in 2002 to mitigate the risks associated with low-frequency MIFARE Classic cards – MIFARE Classic cards have been vulnerable to hacking since at least 2007.
DESFire range has since spawned multiple generations including the two we are looking at today: EV1 and EV2. Note that there is also a newer range EV3 available, however, this post aims to look solely at the difference between DESFire EV1 vs EV2. For information about DESFire EV3 cards or any other MIFARE cards, check out our handy guide to the types of MIFARE cards.
Overall security and performance of the pair, EV1 and EV2 both operate at a frequency of 13.56MHz and use the same highly secure AES-128 encryption.
Key applications for EV1 and EV2 products include:
DESFire means, the ‘DES’ is indicative of the high-security level the cards use (3DES and or AES hardware). The ‘Fire’ element represents the cards’ key qualities: fast, innovative, reliable and secure.