An Ultimate Guide to Cyber Security for Beginners

What is Cybersecurity?

Before we begin this cyber security for beginners tutorial, let's first understand what cyber security is and its significance. Cybersecurity is the technology and process designed to protect networks and devices from attacks, damage, or unauthorized access.

Cybersecurity is essential for a country’s military, hospitals, large corporations, small businesses, and other organizations and individuals since data is now the cornerstone of any organization. If that data is exploited, there are many risks. Now that we have understood cybersecurity, let’s see what the CIA triad is and how it relates to cybersecurity. To gain a deeper understanding and expertise in this field, one can consider enrolling in the following Cybersecurity Courses.

Advance your career with the Advanced Executive Program in Cybersecurity. Gain industry-relevant skills, hands-on expertise, and certifications from top institutions. Enroll today!

CIA Triad

The security of any organization starts with three principles: Confidentiality, Integrity, and Availability. This cyber security for beginners tutorial will teach us about the CIA Triad, the industry standard for computer security since the first mainframes.

     Fig: CIA triad

• Confidentiality: The principles of confidentiality assert that only authorized parties can access sensitive information and functions. Example: military secrets.
• Integrity: The principles assert that only authorized people and means can alter, add, or remove sensitive information and functions. Example: a user entering incorrect data into the database.
• Availability: The availability principles assert that systems, functions, and data must be available on demand according to agreed-upon parameters based on service levels.

Next up in the cyber security for beginners tutorial, let’s look at the areas and specialties in cybersecurity to understand the space better.

Specialties in Cybersecurity

To pursue your career in cybersecurity, it is essential to know about the areas of specialization in it, and this cyber security for beginners tutorial will help you do just that. There are nine:

1. Access control systems and methodology: This protects critical system resources from unauthorized modification.
2. Telecommunications and network security: This focuses on communications, protocols, and network services, as well as the potential vulnerabilities associated with each.
3. Security management practices: This area effectively deals with catastrophic system failures, natural disasters, and other service interruptions.
4. Security architecture and models: This focuses mostly on having security policies and procedures in place. This particular security domain involves policy planning for just about every type of security issue.
5. Law, investigation, and ethics: This handles the legal issues associated with computer security.
6. Application and system development security: This person covers database security models and implements multilevel security for in-house applications. 
7. Cryptography: Designed to help you understand how and when to use encryption. 
8. Computer operations security: This covers everything that happens while your computers are running. 
9. Physical security: This addresses questions about physical access to your servers and workstations.

Get help in becoming an industry-ready professional by enrolling in a unique Advanced Executive Program in Cybersecurity. Get valuable insights from industry leaders and enhance your interview skills. Enroll TODAY!

Basic Terminologies

1. Network

A network is a connection between two or more computers that communicate. For example:

Fig: Network Connection

2. Internet

Internet connects a computer to any other computer anywhere in the world via dedicated routers and servers.

3. Internet Protocols

Data that is transferred or received cannot follow any path. A set of rules is followed to control the flow of the Internet. These rules are called Internet protocol.

4. IP Address

An Internet Protocol address (IP address) is assigned to all devices that connect to a computer network and use the Internet Protocol for communication. An IP address looks like this: 168.192.10.3

5. MAC Address

Every device has a unique identification number that connects to the internet. Traditional MAC addresses are 12-digit hexadecimal numbers. MAC address looks like this: D8-FC-93-C5-A5-EO.

6. Domain Name Server(DNS)

Consider DNS as the phonebook of the internet. All the IP addresses and the names of the links are saved in it. For example, you want to go to google.com. You type this on your web application. Then, this name goes to the DNS server, and the DNS server finds the IP address of google.com. Then, the DNS server returns it to your computer with the IP address.

Fig: DNS Server Illustration

7. DHCP

The dynamic host configuration protocol assigns an IP address to any device that wants to connect to the Internet.

Fig: DHCP providing IP addresses

8. Router

This device routes the data that comes to it and then sends it to the destination to ensure that it is on the appropriate path.

9. Bots

Bots are computer programs that control your computer without your knowledge. They automatically send emails, retrieve web pages, and change computer settings.

Common Types of Attacks

Before we get into the types of attacks, we should know why these attacks happen, and this cyber security for beginners tutorial will help you learn A-Z of both. Every attack has a motive; the main reason for attacks is money. Hackers penetrate the system and then demand ransom from the victims. There are other reasons, such as a financial loss to the target, a state’s failure to achieve its military objective, damage to its reputation, or political maneuvering.

There are mainly five types of attacks:

1. Distributed denial of service(DDoS)
2. Man in the middle
3. Email attacks
4. Password attacks
5. Malware attack

In the next section of this cyber security for beginners tutorial, let’s look at all the attacks in detail:

1. Distributed Denial of Service

It is an attack used to restrict a user from accessing resources by flooding the traffic that is used to access resources. A botnet controller controls all the bots under it. The attacker sends a command to the botnet controller that tells all bots to attack a server so that the server will be flooded. When a user wants to access a website, he will not be able to, as the traffic on the website will be at full capacity.

      Fig: DDoS Illustration

2. Man in the Middle

Let’s look at an example to understand this better. Suppose you want to do an online transaction, and you connect to your bank and make the payment.

   Fig: Man in the middle attack (1)

Now, while you are completing the transaction, you have to enter your credit card details and PIN. The attacker can spoof you and monitor your transaction. As soon as you enter your details, he will see them.

  Fig: Man in the middle attack (2)

3. Password Attack

We use this technique to crack or find a password. There are five types of password attacks:

• Dictionary attack: In this method, we handle every possible password through the dictionary.
• Brute force: This trial-and-error method decodes the password or data. This attack takes the most time.
• Keylogger: As the name suggests, a keylogger records all keystrokes on a keyboard. Most hackers use keyloggers to get passwords and account details.
• Shoulder surfing: The attackers observe the user’s keyboard by looking over the user’s shoulder.
• Rainbow table: Rainbow tables contain precomputed hash values. Attackers use these tables to find a user's password.

4. Email Attacks

First, let’s see how an email works. Suppose John is sending an email to Jack. The email first goes to the email server. Then, it goes to the DNS server to find the destination's IP address. From the source email server, the email goes to the destination server. From there, the email is sent to the IP address on which Jack is working. This is illustrated in the picture below.

       Fig: How email works.

There are three types of email attacks. 

• Phishing: The attacker sends bait, often in the form of an email. It encourages people to share their details. For example, you receive an email like this:
  
  
  
  If someone is a customer of ABC Bank, he would probably open the link and give the details. However, these emails are always phishing; banks do not send emails like this.
• Spoofing: The attacker pretends to be another person or organization and sends you an email stating it is legitimate. For example:
  
  
  
  After seeing this email, you might share the password to your computer. Always ask the person from whom you received the email one more time to confirm that he is the right person.
• Email attachments: You can send files through emails. These files may be images, documents, audio, or videos. Attackers send you an email, and you are encouraged to open the attached file. For example:
  
  

Download these attachments only if you know it is a legitimate email.

5. Malware Attack

• Malware: This is a malicious program or software that disrupts or damages the computer. There are three types of malware.
• Virus: A computer virus is a malicious code that replicates by copying itself to another program or document and changes how a computer works. The virus requires someone to knowingly or unknowingly spread the infection without the knowledge or permission of a user or system administrator. An example of a virus is the Melissa virus.
• Worms: These are standalone programs that run independently and infect systems. For example, W32.Alcra.F is a worm that propagates through network share devices.

Get the Skills to Ace a Cybersecurity Interview

Cyber Security Expert Master's ProgramStart Learning

Functions of Malware

1. Overwhelming system resources: Malware, especially worms, can spread around and overwhelm a system or network. Some malware creates so many folders that no memory is left and slows a computer down.
2. Creating a backdoor: Let’s look at an example: Microsoft sends updates every Sunday on all Windows platforms. How do these updates reach to your Windows OS? They create backdoors from where they can send updates. Similarly, hackers create backdoors from where they can continuously send viruses after getting into a system.
3. Disabling security functions: Some malware can disable antivirus software and security updates. This malware tends to last longer because there is no security to stop it, and it tends to keep the system vulnerable to other malware.
4. Creating botnets: Hackers create botnets by purely coding. A botmaster controls botnets, which are usually used to crash websites. The botmaster tells all botnets to flood the website by accessing it at the same time. 

Sources of Malware

1. Removable media: Removable media, such as pen drives, CDs, DVDs, and flash drives, may be used to send viruses to your system. 
2. Documents and executable files: Viruses can be hidden in document files with the .exe extension. As soon as you open them, the virus activates.
3. Internet downloads: Download files only from trusted websites. If you download from untrusted websites, there may be chances that those files will contain viruses, and as soon as you open them, the hacker might get access to your system. 
4. Network connections: Be sure that your service provider is genuine. If the network is unsecured, then anyone can access it.
5. Email attachments: Never open email attachments unless the sender can be trusted. These files may contain viruses that can create backdoors.
6. Malicious advertisements: Never click on ads that you don’t trust. They are created to get you to click on them, and hackers will receive details about you.

Advance your skills with the Cyber Security Expert Masters Program—comprehensive training in network security, cryptography, and more. Start today and become an in-demand cybersecurity professional. Enroll Now!

Job Roles 

The kind of job you do is something you wish to consider before you step foot in any field. In this section of the cyber security for beginners tutorial, we will learn about the top roles in the cybersecurity field:

1. Chief Information Security Officer: Manages the organization's IT security division.
2. Forensic Computer Analyst: Looks for evidence after the breach or attack on an organization.
3. Information Security Analyst: Protects the computer systems and networks of an organization.
4. Penetration Tester: Penetration testers are highly skilled security specialists who spend their days attempting to breach computer and network security systems.
5. IT Security Engineer: Plan to carry security measures to monitor and protect data and systems from hackers and cyber attacks.
6. Security Architect: Maintain the network security of an organization.
7. Security Systems Administrator: Their responsibilities include installing, administering, maintaining, and troubleshooting computer, network, and data security systems.
8. IT Security Consultant: Protect the organization’s sensitive data.

Cyber Security Certifications

To start your career in the cybersecurity field, you must know the certifications you need to get into this field. Wondering what are they? This cyber security for beginners tutorial has covered that for you, too. The top three certifications are: 

1. CEH (Certified Ethical Hacker): The Certified Ethical Hacking (CEH v13) Course will train you in reverse engineering so that you can better protect corporate infrastructures from data breaches.
   
   
   
   
2. CompTIA Security+: The CompTIA Security+ Certification is globally trusted to validate foundationally, vendor-neutral IT security knowledge and skills.
   
   

Check out the below video, to sum up this tutorial on cybersecurity -

There is substantial evidence that cybersecurity is in demand right now. This demand will continuously grow, and measuring labor supply or demand in this field is challenging. The primary reason for growing this field is that technology is improving daily. It is good that the whole world is working together to reduce cyberattacks because of the economy and global communication. Cybersecurity is a complex subject that requires knowledge and expertise from multiple disciplines, including computer science and information technology.

This cyber security tutorial covers everything you need to know about the fundamentals, basic terminology, and certifications. Suppose you think you’re ready for a challenging yet exciting field like cybersecurity. In that case, you must check out Simplilearn’s comprehensive Cybersecurity Expert Masters program, which covers everything from cybersecurity for beginners to the advanced networking skills you need to build a successful career!