Two-factor authentication e modem: o que têm em comum

1. Passo 1. Two-factor authentication — utiliza — SMS. Codes by SMS.
2. Passo 2. SMS — funciona como — Electrical telegraph. A short text message is the heir of the telegram.
3. Passo 3. Electrical telegraph — evoluiu para — Telephone. The telephone grew out of attempts to send several signals over telegraph lines (the “harmonic telegraph”).
4. Passo 4. Telephone — é utilizado em — Modem. It works over a telephone line.

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