Two-factor authentication and electric generator: what they have in common

1. Step 1. Two-factor authentication — uses — SMS. Codes by SMS.
2. Step 2. SMS — works like — Electrical telegraph. A short text message is the heir of the telegram.
3. Step 3. Electrical telegraph — has part — Copper wire. Communication lines.
4. Step 4. Copper wire — is part of — Electric generator. Windings.

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