Question

Two companies that have never exchanged keys before want to begin sending encrypted messages to each other over the internet. They need a way for each party to share a value that lets the other encrypt data without ever transmitting a secret key that an eavesdropper could capture. Which type of cryptography is designed to solve this problem?

Accepted Answer

Asymmetric (public-key) encryption, where each party publishes a public key and keeps a private key

Answer

Symmetric encryption, where both parties use the same shared secret key

Answer

Hashing, which produces a fixed-length digest of the message

Answer

Steganography, which hides the message inside another file