Public Key Encryption

It is a form of trusted service between client and server. In such a system both client and server are provided with two keys, viz. Public key and private key. They are used to encode and decode messages. Each key is a larger integer.

The public key encryption mechanisms can be used to provide authentication & privacy in a different way.

Authentication mechanisms:

The sender first publishes its public key in a key in a public database and keeps its private key secret. The sender encodes a message using senders public key. By this way, only authorized user receives and sends the message.

Privacy mechanism:

The sender uses the receiver’s public key to encode the message and the receiver uses its private key to decode the message. This way necessary privacy can be given to the users of internet.

Further messages can be encoded twice to authenticate sender as well as enforce privacy.

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Related: Internet Security | Internet Firewall