Problem
Elliptic-Curve Diffie-Hellman (ECDH) is commonly used for establishing keys. What is its main advantage over classical Diffie-Hellman? Select one alternative:
1. Elliptic curve based algorithms are resistant against quantum computers, so they are more future-proof.
2. Efficiency: we speed up computation at the same security level.
3. In ECDH we introduce a masking ciphertext, based on a random value. This means we don't need a random padding algorithm.