Cryptography

The process of converting plain text to some other text that is only readable not understandable called cryptography.Converted text is called cypher text.Cryptography is not only use for convert plain text to cypher text but also used for authentication purpose whom data is send.
There is only two process is used in cryptography Encryption and Decryption plain text convert in to cypher text called encryption and cypher text convert in to plain text called decryption.

there are two type of Encryption

1)Symmetric Key Encryption

In Symmetric Key Encryption same key is used for Encryption and Decryption.It can be Public Key or can be private key.Public key is the key that is know by all user while Private key is the key that is know by only user that is the owner of the message.

2)Asymmetric key Encryption

In Asymmetric key data encryption different-different key is used for encryption and decryption.If sender encrypt the data using public key of the receiver then receiver can decrypt the message only by use private key of own.And its vise versa is also possible.