What are side-channel attacks?

A side-channel attack is like sneaking a peek at someone’s homework while they’re not looking, you don’t need to know the answer, just how long it took them to solve it.

Imagine your friend has a secret code that lets them open the treasure box in the classroom. You can't see the code, but you notice that when they try different numbers, their face changes, sometimes they frown, sometimes they smile. That’s like a side-channel attack: instead of knowing the secret code directly, you watch how they react to guess it.

Think of your friend as a lock and the code as the key. Normally, you’d need the full key to open it. But if you can see how long it takes them to try different numbers, or maybe how much their hands shake when they get the right one, you can figure out parts of the key without knowing all of it.

That’s like a side-channel attack in real life: instead of breaking the lock, you use clues from how it works, like time, sound, or even heat, to find the key. It's like having a detective friend who knows exactly what to look for!