Zombie Card Attack Revives Expired Visa Cards for Contactless Payments
Researchers at the University of Massachusetts Amherst have demonstrated a novel attack, dubbed "Zombie Card," that can revive expired Visa contactless credit…
Tag: American Express
American Express Kernel 4 Blocks Zombie Card Modification
American Express's EMV contactless kernel (Kernel 4) binds the expiration date into static data covered by offline data authentication, producing a hash…