ASYMMETRIC (public-key) cryptography uses

1. ASYMMETRIC crypto: a key PAIR — anyone can encrypt to your public key, only your private key can decrypt. 2. Examples: RSA, ECC (Elliptic Curve), DSA, ElGamal. 3. SOLVES key distribution: you can publish your public key openly; secrecy of the private key is all that matters. 4. TRADE-OFF: much slower than symmetric (1000s of times). In practice: use asymmetric to exchange a session key, then symmetric for the actual data (HYBRID scheme). 5. Other options describe other cryptographic primitives. _Source: Boneh & Shoup, "A Graduate Course in Applied Cryptography", §10 (Public-key encryption)._