What is Asymmetric or public key encryption ?

" Asymmetric key encryption is a type of encryption, also called public key encryption. It uses a public key to encrypt a message, and only decrypt with the private key of the recipient, so called Asymmetric or public key encryption."

Asymmetric key encryption is a kind of encryption which uses RAS algorithm, a well know algorithm for Asymmetric encryption, to encrypt a message. Asymmetric key encryption uses a public key of the recipient and RAS algorithm to encrypt a message and only decrypts a message when private key of the recipient is used to decrypt the message.
Because in this encryption technique public key is used to encrypt a data, and decryption only takes place when secret key of the recipient is found, So there is no need to manage any key and secrecy of data also remain as it is. It is a more reliable technique than symmetric key encryption.. However Asymmetric key encryption is slower than Symmetric key encryption technique.

Asymmetric key encryption is used by e-mails service provider like Gmail, hotmail and yahoo. It is also used by social media like facebook, orkut and whats app to maintain the secrecy of your messages.

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