Snapper is a new generation contactless smartcard and according to our technical team...
- we use finance industry standard authentication mechanisms based on 3DES to protect transactions and ensure cards do not accept unauthorized data
- every Snapper is protected from replaying of previous messages and man-in-the-middle attacks
- the keys held on the card are not externally accessible and are set at time of manufacture.
And who are we to argue with them - they're the technical team and they know what they're talking about!