What are Digital Certificates?

A digital certificate is an attachment tagged to an electronic message for security purposes. It allows the sender of a message to be verified by the recipient, that the sender is actually the person he or she claims to be. In addition, it allows the recipient to reply to the message in a ‘secure’ way, so that only the sender of the original message and nobody else receives it.
The most important things in Digital certificates are as follows-

-> Identification information
-> Cryptographic keys
-> Digital signature

Cryptographic Keys-
A digital certificate has a pair of coupled cryptographic keys. These are symmetric and asymmetric cryptographic.
Symmetric cryptographic key uses only one key between two parties i.e. encryption and decryption is done by same keys.
Asymmetric cryptographic key uses different keys between two parties i.e. encryption and decryption is done by different keys. These keys always work in pairs i.e. one key is public to all which is only for the owner known as public key and private key is distributed to all the users which is always different from one customer to other. The main work of these...