Aliro is more secure than NFC cards and even older proximity cards, like those used to access office buildings. Since Aliro is an offline digital key system, it's harder to clone, more stable in low-signal environments like underground garages, and more scalable when multiple keys for a building are required.
The new standard is designed to be secure, using modern cryptographic methods. Your phone or smartwatch stores a private key that never leaves your device, just as Apple and Google secure your contactless payments. Even if someone were capable of intercepting the signal, they couldn't generate a valid key without the private credentials that are stored on your device.
