The internal algorithm used by smart cards to generate nonces (random numbers used once) for secure authentication. Vulnerabilities in a tag's PRNG are what allow the Chameleon Ultra to crack keys.

For security professionals and hobbyists, this "pocket laboratory" bridges the gap between the portability of the Flipper Zero and the raw power of a Proxmark3. Its ultra-low power consumption—capable of lasting months on a single charge—makes it a practical tool for everyday use in access control testing and protocol validation. chameleonultragui · RfidResearchGroup/ChameleonUltra Wiki