What is Kali Linux?
In a simple word, Kali Linux is a Linux Distribution with lots of hacking tools based Debian. Kali Linux is a new version of  Backtrack Linux! Many people said that two are completely different. Actually, Kali Linux is improved version of Backtrack Linux including more tools for work. Kali Linux is now Number 1 Operating System for Hackers.

Spam is an information simultaneously given to many people (who don't deserve message). In most cases, spam is spread by affiliating itself with some or other services for advertising or promotional purposes.

Spamming on Various Media:

The word cyber crime is not only in Bangladesh, it also very familiar and scary word in every country. Whether it is known or not, its victims are millions of people every day. Cyber crime is not a new kind of crime in the world. Common crimes like information theft, information distortion, fraud, blackmail, money laundering etc are in the general language as a cyber crime. In other languages, cyber crime is mainly used on computers and criminals use the network to crime worldwide. The US Federal Bureau of Investigation (FBI) is divided Cyber Crime into four main categories - Insiders, Hackers, Virus Writers and Criminal Groups.

Different types of Cyber Crime:

Many of us have heard the name of the Deep or Dark Web several times. There is a lot of rumor about Deep Web. Someone says it's the kingdom of Hacker, the heaven of black money and contract killers deal among the mafia. Someone thinks that there is a system to make a connection with the aliens and some people say that space is mysterious. What do you think? What happens here?

The entire Internet world is mainly divided into three parts. Surface Web, Deep Web and Dark Web.
The surface web is the web which we can easily access through various search engines and URL. Surface Web is only about 2% of the total World Wide Web. The Deep Web and Dark Web has the remaining 98%. Imagine, how big is the circumference?

What is Deep Web?
The sites that are not open to the public, the creator or the founder doesn't want to show the site to someone from the web or the search engine. Site owner hides their secret information or content here from us. It would be their database, customer details, employee details, business plan etc. Deep web is not an illegal thing.

What is Dark Web?
Dark Web is the darkest part of the Internet that is totally illegal. Dark web is used for various illegal activities such as illegal trade, child pornography and other terrorist activities. Heroin, Cocaine, AK 47, Rocket Launcher, Samurai Killer etc are available here. Anyone can purchase those things by paying Bitcoin.

How to access the Dark Web?
The way we usually access the internet, that can not go to the Dark Web. We have to access the normal internet with Google Chrome, Mozilla Firefox, Maxthon Browser, Opera Mini, Safari etc, but we need to use a different browser to access the Dark Web. This browser name is TOR. Full meaning The Onion Router.

To access the Dark Web, we must adhere to some security protocols for our protection. We need to change your IP address to avoid leak our information. We should remain very aware when we access the Dark Web. Police or Hacker can track our identity. As Dark web is illegal, so we should avoid this. 

Hacking is a process where someone enters a computer or computer network without any valid permission. Who done hacking they are Hacker. We all are thinking that hacking is just hack any website or hack any computer or computer network, isn't it? No, not really. There may be many types of hacking. Mobile Phones, Land Phones, Car Tracking, Different Electronics and Digital Equipment using without useful permissions can be under Hacking. Hackers usually find the errors of these electronics devices for hacking them.

Types of Hackers:
The person who practices the hacking is called a hacker. They know all the information including system structure, working process, how it works etc of the hackable system.

There are mainly Three types of Hacker. They are:
1. White Hat Hacker
2. Gray Hat Hacker
3. Black Hat Hacker

Bitcoin is virtual and decentralized currency that is powered by software and cryptography. Nobody knows who has discovered Bitcoin. But Bitcoin inventor who operate this known as Satoshi Nakamoto. Bitcoin comes in the online world in 2008. Bitcoin works according to the peer-to-peer transformation system. General currency is controlled by the government. Whenever they are needed they make new money. Bitcoin has no such conviction rules. But there is a limit on making bitcoins. Mining will stop automatically after reaching 31 million Bitcoin. If the amount of bitcoin is increased too much, its prices will also decrease. That's why they take this step.

Bitcoin can be converted to money at very low cost. Bitcoin is also known as crypto currents because of the use of advanced cryptography. There are currently 25 million Bitcoins in the world and 5 million Bitcoins have been lifted and the remaining 20 million are waiting for the transaction. Adding 25 Bitcoin to the network in every 10 minutes. Bitcoin prices are increasing almost every day. In 2016, the price of 1 bitcoin was only $1,000, but in July of 2017, it stood at about $2,500. Experts think that the price could touch in $5000.