The Crucial Role of OTP in Preventing SIM Swap Fraud
Blog post from Didit
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SIM swap fraud occurs when criminals deceive mobile carriers into transferring a victim’s phone number to a SIM card they control, allowing them to intercept SMS one-time passwords, reset account credentials, and access banking, email, social media, and other services. Although OTPs strengthen authentication compared with passwords alone, SMS delivery becomes a vulnerability when a phone number is compromised, making layered authentication essential. Recommended defenses include authenticator apps, hardware security keys, biometric checks with liveness detection, stronger phone verification during onboarding and recovery, stricter carrier porting procedures, user education, behavioral monitoring, and enhanced internal controls. The text presents Didit as a modular identity-verification platform offering phone and email verification, document checks, facial matching, liveness detection, fraud blocklisting, APIs, and workflow tools intended to help businesses reduce account takeover and SIM-swap-related risks.
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