Password and telephone: what they have in common

1. Step 1. Password — is used in — Two-factor authentication. Password + a second factor.
2. Step 2. Two-factor authentication — uses — SMS. Codes by SMS.
3. Step 3. SMS — works like — Electrical telegraph. A short text message is the heir of the telegram.
4. Step 4. Electrical telegraph — evolved into — Telephone. The telephone grew out of attempts to send several signals over telegraph lines (the “harmonic telegraph”).

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