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Stored values cards were the way French public phone booths worked when they first moved away from coins in the 80s. There were single-use chip cards that you
by mytailorisrich 1y ago
Stored values cards were the way French public phone booths worked when they first moved away from coins in the 80s.
There were single-use chip cards that you bought and kept in your wallet. Plain eeprom.
I remember I built a reader for them as a teenager...
- lxgr 1y agoThese were storage only though, right? Such systems are trivial to compromise. Stored-value payment cards usually contain at least a secret key and some logic that allows them to establish a secure channel to another trusted entity, such as a merchant smartcard (which can be embedded in a terminal) or a backend server (and a corresponding HSM).