The world of identity is always changing. Something new comes along every year that really changes things. We used to use passwords, then we started using two-factor authentication. Now the big technology companies are talking about something called Passkeys.
So what are passkeys? Why do people think they are the future of authentication? Let us take a look at passkeys and find out what they are all about, why they matter, and how they change digital identity and authentication.
The Password Problem: A Legacy Burden
Before we think about the future, we should look at the past. Passwords have been part of our online lives for a very long time, but they are far from perfect.
One major weakness is that most people choose passwords that are easy to remember. Unfortunately, those passwords are also easy to guess or crack. This makes it easier for attackers to gain unauthorized access.
Another issue is password reuse. Many people use the same password across multiple websites. If one site is breached, attackers can often access other accounts as well.
Phishing is also a serious problem. Phishing attacks trick users into giving away their login credentials by pretending to be legitimate services.
Memorability is another challenge. People are expected to remember dozens or even hundreds of complex passwords, which leads to password fatigue and poor security practices.
Passwords are typically stored on servers, making them a valuable target for attackers. Large-scale breaches can expose millions of credentials at once.
Two-factor and multi-factor authentication improve security, but they can still be vulnerable to advanced phishing attacks, SIM swapping, and man-in-the-middle attacks.
Enter Passkeys: A Passwordless Revolution
Passkeys aim to eliminate passwords entirely. They provide a simpler and more secure way to log into websites and applications while being highly resistant to phishing.
What Is a Passkey?
A passkey is a digital credential that lets you sign in using your device’s built-in authentication methods, such as a fingerprint, face scan, or PIN.
Unlike passwords, passkeys do not rely on shared secrets stored on servers. Instead, they use a pair of cryptographic keys.
- Public Key: Stored by the website or service.
- Private Key: Stored securely on your device.
When you log in, your device uses the private key to prove your identity. The private key never leaves your device, keeping it safe from attackers.
How Passkeys Work Under the Hood
Passkeys use public-key cryptography. When you log in, your device and the website exchange cryptographic challenges to verify your identity.
This process allows you to sign in without remembering a password, while providing strong protection against guessing and phishing attacks.
Passkeys are built on open standards created by the FIDO Alliance and the W3C, including WebAuthn and CTAP.
Simplified Authentication Flow
- 1. Your device creates a unique key pair for the service.
- 2. The public key is stored by the website.
- 3. The private key stays securely on your device.
- 4. You attempt to log in to the website.
- 5. Your device verifies your identity (fingerprint, face scan, or PIN).
- 6.. The private key signs a challenge from the website.
- 7. The website verifies the signature using the public key.
- 8. You are logged in.
Notice what is missing: a password. Even if an attacker intercepts the communication, they only see a signed challenge, not your private key.
This makes passkeys highly resistant to phishing and credential theft, and a strong candidate for the future of authentication.