Which of the following is a purpose of asymmetric encryption?

Asymmetric encryption is designed to enhance security by utilizing a key pair: a public key and a private key. The public key is shared openly and can be used by anyone to encrypt a message. However, only the holder of the private key can decrypt that message, ensuring that sensitive information is kept secure. This dual key mechanism allows for secure communications without requiring the parties to share confidential information beforehand.

In contrast, options that suggest speeding up the encryption process, eliminating the need for public keys, or using a single key for all encryptions do not align with the fundamental principles of asymmetric encryption. This encryption method is typically slower than symmetric encryption, which utilizes just one key for both encryption and decryption, therefore not focusing on speed as its primary purpose.