With public key cryptography, the private key is kept secure and private while the public key is publicly available. Here is an example of how the keys work to facilitate the exchange of confidential communications or a shared secret: If Alice and Bob want to exchange a secret message, Alice (the sender) will encrypt the message using Bob's.. So when a person uses asymmetric key encryption to send a message, both the sender and the recipient begin by generating a key pair (i.e. a public and a private key each) on their respective computers. A popular way of doing this is using the RSA algorithm, which comes up with a set of a public and private key that are mathematically linked to.

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The sending computer encrypts the secret data using the receiving computer's public key and a mathematical operation. The power of public key encryption is in that mathematical operation. It's a "one-way function", which means it's incredibly difficult for a computer to reverse the operation and discover the original data.. Public key cryptography is a method of encrypting or signing data with two different keys and making one of the keys, the public key, available for anyone to use. The other key is known as the private key. Data encrypted with the public key can only be decrypted with the private key. Because of this use of two keys instead of one, public key.