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Can't they replace online database with asymmetric cryptography in that QR code? This way a machine can validate manufacturing date even offline, i.e. more reli
by Const-me 10y ago
Can't they replace online database with asymmetric cryptography in that QR code? This way a machine can validate manufacturing date even offline, i.e. more reliably.
- dingo_bat 10y agoBut then how do they recall contaminated pouches?
- Const-me 10y agoDepends. If it’s contaminated ‘coz expired, it’s doable. Many devices have accurate real-time clocks even offline, e.g. GPS. It’s easy to include the expiry date in that cryptographically-signed data. BTW, Kerberos protocol does similar things with their timestamps. If however it’s contaminated just because the producer decided to recall a batch of their product, then yes, a centralized server is a good choice.