Here's a (fairly) quick summary from my AI chatbot:
The Old Way: Passwords (Like a Shared Secret Key)
Imagine you have a lock (your online account) and you make a physical key (your password) for it.
- You make a copy of your key and give it to the company (website) so they can keep it.
- Every time you want to open the lock, you take your key, and the company checks if it matches their copy.
- The problem: If someone steals the company's copy of your key, or tricks you into giving them your key, they can open your lock. And if you use the same key for many locks, then stealing one copy opens everything!
The New Way: Passkeys (Like a Special Handshake)
Now, imagine your lock (online account) and your device (phone, computer) are much smarter.
- When you "make" a passkey:
- Your device creates two special, unique pieces of a puzzle just for that specific website.
- One piece is like a "public puzzle piece" that it sends to the website. The website keeps this.
- The other piece is a "private puzzle piece" that stays only on your device. It never leaves.
- Crucially: These two pieces are related, but you can't figure out the private piece just by knowing the public piece.
- When you "log in" with a passkey:
- You tell your device, "Hey, I want to log into Example.com."
- Your device then does a special "handshake" with Example.com using its private puzzle piece. It doesn't send the private piece; it just uses it to solve a little challenge given by the website.
- The website then uses its public puzzle piece to verify that your device's answer to the challenge is correct.
- If it matches, you're logged in!
Why is this much safer?
- No Secret to Steal from the Website: The website only has the "public puzzle piece," which is useless to a hacker. They can't use it to log into your account, and they can't figure out your private piece from it.
- Phishing Proof: The "handshake" only works with the real website. If a hacker tries to trick you with a fake website, your device will know it's not the right one and won't do the handshake. You literally can't be phished into giving away your passkey.
- Unique for Every Account: Every passkey is unique for every website. No more worrying about reusing passwords!
- You're the Key: To activate the "handshake," your device needs to confirm it's really you. This is why you often use your fingerprint, face scan, or PIN to unlock your phone before using a passkey. This adds an extra layer of security.