Public Key Cryptography

Public key cryptography, also known as asymmetric cryptography, is a cryptographic system that uses pairs of keys: a public key that can be shared openly and a private key that is kept secret. It enables secure communication, digital signatures, and key exchange without requiring prior shared secrets between parties. This system forms the foundation for many modern security protocols, including SSL/TLS, SSH, and PGP.

Also known as: Asymmetric Cryptography, Public-Key Cryptography, PKC, Asymmetric Encryption, Public-Key Encryption

Why learn Public Key Cryptography?

Developers should learn public key cryptography when building secure applications that require authentication, encryption, or data integrity, such as web services, messaging apps, or blockchain systems. It is essential for implementing HTTPS, securing API communications, and creating digital signatures to verify data authenticity. Understanding this concept helps in designing systems that protect against eavesdropping and tampering in untrusted networks.

Learning Resources

• video: Khan Academy - Public Key Cryptography
• docs: Wikipedia - Public-key Cryptography
• course: Coursera - Cryptography I by Stanford University
• tutorial: Practical Cryptography for Developers
• book: Introduction to Modern Cryptography by Jonathan Katz and Yehuda Lindell