<aside> <img src="/icons/package_gray.svg" alt="/icons/package_gray.svg" width="40px" /> Public Key Cryptography does not require a shared secret key

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Uses a key pair

• Public key for encryption
• Private key for decryption

Confidentiality with Public Key

• Encrypt data using the receiver’s public key
• Only the recipient with the corresponding private key can decrypt it

Non-Repudiation with Private Key

• Encrypt data using the sender’s private key
• Anyone with access to the sender’s public key can verify the sender’s identity

Integrity and Authentication with Digital Signatures

• Create a hash digest of the message
• Encrypt the hash digest with the sender’s private key
• Encrypt the message with the receiver’s public key
• Ensures message integrity, non-repudiation, and confidentiality

Common Asymmetric Algorithms

• Diffie-Hellman
• RSA (Ron Rivest, Adi Shamir, Leonard Adleman)
• Elliptic Curve Cryptography