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* Pre-printed codes (like in Google) * Trusted friends (like in Facebook) * Renew your password in the office (like in my university) * User-side SSL certifi
by darkhorn 10y ago
* Pre-printed codes (like in Google)
* Trusted friends (like in Facebook)
* Renew your password in the office (like in my university)
* User-side SSL certificate
* Oh, end then Telegram introduced PIN+TFA