How private public key encryption works

with private and public key encryption any key can be used to encrypt and decrypt or

if data is encrypt with public key then it will be decrypted by private key and same way if private key is used to encrypt data then public key can decrypt it?

 

why private key is not shared in asymetric encryption ?

What you are saying is Asymmetric key Cryptography, where two keys are used as Public and Private Key, hence encryption as well as the decryption can be done in any of the key, just the difference is, if you are using Public key for encryption than you have to use the Private key for decryption and vice versa.

 

The keys are simply large numbers that have been paired together but are not identical (asymmetric). One key in the pair can be shared with everyone; it is called the public key. The other key in the pair is kept secret; it is called the private key. Either of the keys can be used to encrypt a message; the opposite key from the one used to encrypt the message is used for decryption.

For more Clearance on the topic, Refer Information Security by William Stallings



Hope that helps !