What is the key feature of asymmetric encryption?

Asymmetric encryption is characterized by the use of a pair of keys: a public key and a private key. The public key is used for encryption, while the private key is used for decryption. This dual-key system enhances security because the private key remains confidential to the owner; only the corresponding public key is shared with others who wish to send encrypted messages.

In this method, anyone can encrypt data using the public key, but only the holder of the private key can decrypt that data, thus ensuring secure communication. The separation of keys allows for added benefits, such as digital signatures, where a sender can use their private key to sign data, while others can use the sender's public key to verify the authenticity of the signature.

In contrast, symmetric encryption uses the same key for both encryption and decryption, which does not provide the same level of security in terms of key distribution and management. The options that suggest only one key or faster processing rates do not capture the essence of what makes asymmetric encryption distinctive and secure.