I’ve been looking at how QR-based digital membership systems handle authentication and token validation, especially in environments like museums, attractions, and other membership-based organizations.
One thing that seems easy to overlook is replay protection. If a QR code is used for entry validation, simply checking whether the code is valid may not be enough. A copied screenshot or intercepted token could potentially be reused unless there are additional controls in place.
Some areas I’m interested in exploring are:
- Short-lived or rotating QR tokens
- Cryptographic signatures for token validation
- Replay detection at the validation endpoint
- Device-side versus server-side verification
- Protecting API credentials on kiosk or scanning devices
- Testing the implementation for common side-channel or fault-injection issues
For example, a digital membership platform such as MembershipAnywhere can use QR-based digital membership cards for member verification. From a security-testing perspective, I’m curious how others would approach testing the complete validation flow rather than just the application/API layer.
Would ChipWhisperer be useful for evaluating any part of this type of system, particularly where a physical scanner or embedded validation device is involved?