OTP systems look simple.
Generate code → send to user → verify → done.
That’s what most implementations look like.
But in real-world systems…
👉 OTP is one of the most sensitive security layers.
So I created a small challenge on VibeCode Arena to test how well AI handles this.
And the results were interesting.
🚨 The Problem
Here’s the basic logic:
- Generate a 6-digit OTP
- Store it
- Match it during verification
Everything seems correct.
But there’s a serious issue.
⚠️ What Can Go Wrong?
In real-world systems:
• OTP can be reused multiple times
• No expiry means it stays valid forever
• No limit on attempts → brute force possible
• Multiple OTP requests overwrite each other
• No protection against abuse
And suddenly:
👉 Anyone can guess the OTP
👉 Security is completely broken
🧠 What I Observed
When AI models tried this challenge:
- Some generated OTP correctly
- Many ignored expiry logic
- Some didn’t prevent brute force
- Very few handled real-world security concerns
The code works.
But the system is not secure.
🔥 Try My Challenge
I created this challenge to test real-world authentication thinking.
👉 Try it here:
https://vibecodearena.ai/duel/a38077a5-adf3-437a-948f-710d293125f6
Can you:
- Add OTP expiry?
- Prevent brute-force attacks?
- Ensure OTP is used only once?
- Design a secure verification system?
💡 What Makes This Interesting
This is not just a coding problem.
It’s about:
• Security
• Abuse prevention
• System design
• Real-world reliability
And this is where most AI solutions struggle.
🎯 Final Thought
OTP is not just a number.
It’s a trust mechanism.
And if you don’t secure it properly…
👉 Anyone can break it.
Try it and tell me 👇
Did AI handle security properly… or miss something critical?
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