Public Key Authentication

Public Key Authentication is a cryptographic method for verifying identity in secure communications, using a pair of keys: a public key shared openly and a private key kept secret. It enables passwordless authentication by proving possession of the private key without transmitting it, commonly used in SSH, SSL/TLS, and digital signatures. This approach enhances security by eliminating password-based vulnerabilities like brute-force attacks and credential theft.

Also known as: PKI Authentication, Asymmetric Key Authentication, Key-based Authentication, SSH Key Authentication, Digital Signature Authentication

Why learn Public Key Authentication?

Developers should learn Public Key Authentication for secure remote access (e.g., SSH to servers), automating deployments without password prompts, and implementing secure APIs or client-server applications. It's essential in DevOps for managing infrastructure, in web development for HTTPS certificates, and in blockchain for wallet security, providing stronger authentication than passwords alone.

Learning Resources

• docs: SSH Academy: Public Key Authentication Guide
• tutorial: DigitalOcean: How to Set Up SSH Keys
• video: Khan Academy: Public Key Cryptography
• course: Coursera: Cryptography I by Stanford
• docs: OpenSSH Manual: Authentication