Asymmetric Cryptography

Asymmetric cryptography, also known as public-key cryptography, is a cryptographic system that uses pairs of keys: a public key, which can be widely distributed, and a private key, which is kept secret. It enables secure communication, digital signatures, and key exchange without requiring prior shared secrets between parties. This contrasts with symmetric cryptography, which uses a single shared key for both encryption and decryption.

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

Why learn Asymmetric Cryptography?

Developers should learn asymmetric cryptography for implementing secure systems such as HTTPS/TLS for web security, SSH for remote access, and PGP/GPG for email encryption. It is essential for scenarios requiring authentication (e.g., digital signatures in software distribution), confidentiality (e.g., encrypting data for specific recipients), and non-repudiation (e.g., blockchain transactions).

Learning Resources

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