What is SQL?

SQL stands for STRUCTURED QUERY LANGUAGE. We can communicate with database through SQL,  a standard language for database.

How to create a TABLE?

Syntax: CREATE TABLE table_name
column_one_name  type,
column_two_name  type,
column_three_name  type,
column_n_name    type     <----------------------- Don't use comma here.
);    <-------------------Here is semicolon.
Here n=1, 2, 3, 4, ---------------------------------

Diffie Hellman algorithm is a public-key algorithm used to establish a shared secret that can be used for secret communications while exchanging data over a public network

It is primarily used as a method of exchanging cryptography keys for use in symmetric encryption algorithms. It was Proposed in 1976 by Whitfield Diffie and Martin Hellman. Diffie-Hellman is currently used in many protocols like Secure Sockets Layer (SSL)/Transport Layer Security (TLS), Secure Shell (SSH), Internet Protocol Security (IPSec), Public Key Infrastructure (PKI).

RSA algorithm is mainly a public key encryption technique used widely in network communication like in Virtual Private Networks (VPNs) for securing sensitive data, particularly when being sent over an insecure network such as the Internet.

RSA algorithm was first described in 1977 by Ron Rivest, Adi Shamir and Leonard Adleman of the Massachusetts Institute of Technology.

In cryptosystem, system needs to make sure that nobody, except the intended recipient, deciphers the message, the people involved had to strive to keep the key secret. In public key encryption technique, a key is split into two keys and they are called as public and private keys. Public key is advertised to the world and private key is kept secret. It is not possible to generate private key using the public key. So, someone who knows the public key cannot decrypt a message after it has been encrypted using the public key.

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