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Public key cryptography involves a pair of keys known as a public key and a private key (a public key pair), which are associated with an entity that needs to authenticate its identity electronically or to sign or encrypt data. Each public key is published and the corresponding private key is kept secret.

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To validate the integrity of the data, the receiving software first uses the signer's public key to decrypt the hash. It then uses the same hashing algorithm that generated the original hash to generate a new one-way hash of the same data.

The publickey map is used for secure networking. Each entry in the file consists of a network user name (which refers to either a user or a host name), followed by the user public key (in hexadecimal notation), a colon, and the user-encrypted secret key (also in hexadecimal notation).

When the goal is to achieve confidentiality, a recipient's public key is used to encrypt messages. On receiving the message, the recipient is able to decrypt the message using his or her pri-vate key. In an asymmetric key cryptosystem, a public key cannot be used to derive the private key.

In cryptography, a public key is a large numerical value that is used to encrypt data. The key can be generated by a software program, but more often, it is provided by a trusted, designated authority and made available to everyone through a publicly accessible repository or directory.