Authentication totp: A Critical Security Measure Against SIM-Swap Attacks

The rise of two-factor authentication (2FA) has been a significant step forward in protecting sensitive information and securing online accounts. However, the widespread use of SMS-based 2FA has created a vulnerability that attackers can exploit. This type of attack is particularly concerning because it can bypass most two-factor authentication systems that rely on text messages.

SIM-swap attacks are a type of cyber attack where an attacker convinces a mobile carrier to reassign a mobile number to a SIM card they control. Once the attacker has control of the number, they can use it to reset the victim's password on any account that uses the phone number as a form of verification and gain access to sensitive information such as bank accounts, emails, and social media profiles.

The major security shortcomings of SMS-based 2FA are phishing – where a user is deceived into sharing the passcode with an attacker – and SIM-swap attacks. However, SMS-based 2FA offers a seamless experience on mobile due to the auto-fill capabilities on iOS and Android that allow a user to stay within the application experience when inputting the passcode.

SMS-based 2FA works by sending a one-time code to your mobile phone via text message, which you then enter to access your account. This option is familiar and easy for users, making it the most widely used type of 2FA. However, its security level is not as high as TOTP-based 2FA.

TOTP-based 2FA, on the other hand, uses a time-based one-time password (TOTP) to authenticate users. This option offers a higher level of security and is more resistant to phishing attacks. TOTP-based 2FA works by generating a one-time code that changes every 30 seconds or so, making it much harder for attackers to intercept and use the passcode.

In conclusion, while SMS-based 2FA may be widely used and easy for users, its security shortcomings make it a less desirable option compared to TOTP-based 2FA. As hackers continue to evolve their tactics, using TOTP-based 2FA can help prevent SIM-swap attacks and protect sensitive information. By understanding the differences between SMS-based and TOTP-based 2FA, organizations and individuals can take a more proactive approach to securing online accounts and preventing account takeovers.