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The SIM smartcard is a cryptographic device that prevents people from stealing/copying/hijacking/cloning other phones/accounts/billing/credit/etc. Each SIM has
by grymoire1 10y ago
The SIM smartcard is a cryptographic device that prevents people from stealing/copying/hijacking/cloning other phones/accounts/billing/credit/etc.
Each SIM has a unique ID that is used to track/bill/identify your phone.
- kalleboo 10y ago> Each SIM has a unique ID To be more precise, the SIM is actually a crypto CPU that stores a private key, and can perform crypto using that private key on behalf of the phone, without betraying the key itself. This is also how Chip-and-PIN debit/credit cards are designed to work (so that a rogue terminal/skimmer can't just clone the card number), although there are various real-world implementation flaws with most of those.