Two-factor authentication und modem: was sie gemeinsam haben

1. Schritt 1. Two-factor authentication — nutzt — SMS. Codes by SMS.
2. Schritt 2. SMS — funktioniert wie — Electrical telegraph. A short text message is the heir of the telegram.
3. Schritt 3. Electrical telegraph — entwickelte sich zu — Telephone. The telephone grew out of attempts to send several signals over telegraph lines (the “harmonic telegraph”).
4. Schritt 4. Telephone — wird verwendet in — Modem. It works over a telephone line.

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