Asymmetric Cryptography Demo (Public/Private Key Encryption with RSA-OAEP)

About Asymmetric Cryptography

Asymmetric cryptography uses two different keys: a public key for encryption and a private key for decryption. This demo uses RSA-OAEP, one of the most widely-used asymmetric encryption algorithms.

• Public Key: Used to encrypt messages and can be freely shared with anyone.
• Private Key: Must be kept secret. Can decrypt messages encrypted with the corresponding public key.
• One-way encryption: Messages encrypted with Bob's public key can ONLY be decrypted with Bob's private key.
• No shared secret needed: With asymmetric encryption, you don't need to share a key beforehand.
• Digital signatures: Asymmetric keys can also be used to verify authenticity (not shown in this demo).
• Slower than symmetric: RSA is computationally expensive (slow), so it's often used to exchange symmetric keys.

Real-world use: When you visit an HTTPS website, browsers use the server's public key to establish a secure connection. This is the foundation of secure internet communication.