The private key in asymmetric key cryptography is kept by

In asymmetric key cryptography, two keys are used: a public key and a private key. The public key is shared openly, while the private key is kept secret by the owner. When a sender wants to send an encrypted message, they use the receiver's public key to encrypt it. Only the receiver, who holds the corresponding private key, can decrypt the message. This ensures confidentiality and security in communication.