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I'm exploring the security implications of OTP (One-Time Password) authentication and wondering about the effectiveness of server-side protections against brute force attacks.

If an attacker attempts to send all possible OTP codes within a 1-second timeframe, is there a chance that the server could accept the correct one and grant the attacker access?

What are recommended strategies or technologies to prevent such rapid-fire OTP brute force attacks and ensure robust security?

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  • Rate-limiting appears to be the most obvious protection. Next being a failure-limit.
    – schroeder
    Commented Jan 29 at 8:53
  • I googled "brute force TOTP" and got quite a few hits including the links above. Please make sure that you look up this kind of thing.
    – schroeder
    Commented Jan 29 at 9:10

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