Why Did Buffer Replace SMS Verification with Email?
The story of moving away from SMS for security and cost balance.
1Seeking Balance in Security
Buffer decided to remove SMS-based two-factor authentication (2FA) to protect user accounts while simplifying the login process. This radical step raised questions about traditional security approaches.
2The Hidden Costs of SMS
International SMS costs and carrier dependencies were costing Buffer hundreds of dollars monthly. Differing regulations across countries also increased administrative burdens.
3SIM Swap Attacks
The biggest weakness of SMS verification was the vulnerability of phone numbers being hijacked. Unencrypted SMS traffic and SIM swap attacks made this method unreliable.
4Advantages of Email Infrastructure
Buffer leveraged its existing email infrastructure to generate time-limited verification codes. This channel, already familiar to users, offered a more secure and sustainable solution than SMS.
5Unexpected Benefits
Post-transition, support requests decreased, and engineering team productivity improved. Email accounts' own 2FA options provided an additional security layer.
6Thinking Beyond Standards
Buffer’s decision may not suit every company but highlights the importance of context-specific solutions. Its focus on real security over security theater sets an example for the industry.
Original article: Overflow - Buffer Resources — Buffer SMS Doğrulamayı Neden E-Posta ile Değiştirdi?