A more thorough explanation:

Definition: Key encryption is a software-cryptography system that uses a secure key pair, consisting of a public key and a private key, to verify a digital signature and decode a secure, coded document. The public key is known to all possible receivers of a message, while the private key is known only to the message's sender. Key encryption transforms the message's characters into an indecipherable “hash.” A person who has the signer's public key can decode the message and detect whether it has been altered and whether it was transmitted using the sender's private key. It does not necessarily identify the sender; identity is verified using a digital certificate.

Example: Suppose Alice wants to send a secure message to Bob. Alice uses key encryption to encode the message using Bob's public key. Bob can then use his private key to decode the message and read it. This ensures that only Bob can read the message, and that the message has not been tampered with during transmission.

Explanation: In this example, key encryption is used to ensure that only the intended recipient (Bob) can read the message. Alice uses Bob's public key to encode the message, which can only be decoded using Bob's private key. This ensures that even if someone intercepts the message during transmission, they will not be able to read it without Bob's private key.