Tutorial Playlist

Cyber Security Tutorial: A Step-by-Step Guide


What is Cybersecurity?

Lesson - 1

Cyber Security for Beginners

Lesson - 2

How to Become a Cybersecurity Engineer?

Lesson - 3

What is Ethical Hacking?

Lesson - 4

What is Penetration Testing?: A Step-by-Step Guide

Lesson - 5

What Is SQL Injection: How to Prevent SQL Injection

Lesson - 6

How to Become an Ethical Hacker?

Lesson - 7

What Is a Firewall and Why Is It Vital?

Lesson - 8

The Complete Know-How on the

Lesson - 9

A Definitive Guide to Learn the SHA 256 Algorithm

Lesson - 10

What Is a Ransomware Attack and How Can You Prevent It?

Lesson - 11

A Look at the Top 5 Programming Languages for Hacking

Lesson - 12

The Most Informative Guide on What Is an IP Address?

Lesson - 13

The Best Ethical Hacking + Cybersecurity Books

Lesson - 14

10 Types of Cyber Attacks You Should Be Aware in 2022

Lesson - 15

The Top Computer Hacks of All Time

Lesson - 16

Top 6 Cyber Security Jobs in 2022

Lesson - 17

The Best Guide to The Top Cybersecurity Interview Questions

Lesson - 18

What Is a Brute Force Attack and How to Protect Our Data Against It?

Lesson - 19

The Top 8 Cybersecurity Skills You Must Have

Lesson - 20

Your Guide to Choose the Best Operating System Between Parrot OS vs. Kali Linux

Lesson - 21

All You Need to Know About Parrot Security OS

Lesson - 22

The Best and Easiest Way to Understand What Is a VPN

Lesson - 23

What Is NMap? A Comprehensive Tutorial for Network Mapping

Lesson - 24

What Is Google Dorking? Your Way to Becoming the Best Google Hacker

Lesson - 25

Your Best Guide to a Successful Cyber Security Career Path

Lesson - 26

The Value of Python in Ethical Hacking and a Password Cracking Tutorial

Lesson - 27

The Best Guide to Understand What Is TCP/IP Model?

Lesson - 28

What Are Keyloggers and Its Effect on Our Devices?

Lesson - 29

Best Guide to Understand the Importance of What Is Subnetting

Lesson - 30

Your Guide to What Is 5G and How It Works

Lesson - 31

How to Crack Passwords and Strengthen Your Credentials Against Brute-Force

Lesson - 32

A Look at ‘What Is Metasploitable’, a Hacker’s Playground Based on Ubuntu Virtual Machines

Lesson - 33

One-Stop Guide to Understanding What Is Distance Vector Routing?

Lesson - 34

Best Walkthrough for Understanding the Networking Commands

Lesson - 35

Best Guide to Understanding the Operation of Stop-and-Wait Protocol

Lesson - 36

The Best Guide to Understanding the Working and Importance of Go-Back-N ARQ Protocol

Lesson - 37

What Are Digital Signatures: A Thorough Guide Into Cryptographic Authentication

Lesson - 38

The Best Spotify Data Analysis Project You Need to Know

Lesson - 39

A One-Stop Solution Guide to Understand Data Structure and Algorithm Complexity

Lesson - 40

Your One-Stop Guide ‘On How Does the Internet Work?’

Lesson - 41

An Introduction to Circuit Switching and Packet Switching

Lesson - 42

One-Stop Guide to Understanding What Is Network Topology?

Lesson - 43

A Deep Dive Into Cross-Site Scripting and Its Significance

Lesson - 44

The Best Walkthrough on What Is DHCP and Its Working

Lesson - 45

A Complete Look at What a Proxy Is, Along With the Working of the Proxy Server

Lesson - 46

A Detailed Guide to Understanding What Identity and Access Management Is

Lesson - 47

The Best Guide to Understanding the Working and Effects of Sliding Window Protocol

Lesson - 48

The Best Guide That You’ll Ever Need to Understand Typescript and Express

Lesson - 49

Express REST API

Lesson - 50

All You Need to Know About Express JS Middleware

Lesson - 51

An Absolute Guide to Know Everything on Expressions in C

Lesson - 52

A Definitive Guide on How to Create a Strong Password

Lesson - 53

Ubuntu vs. Debian: A Look at Beginner Friendly Linux Distribution

Lesson - 54

Your One-Stop Guide to Learn Command Prompt Hacks

Lesson - 55

Best Walkthrough to Understand the Difference Between IPv4 and IPv6

Lesson - 56

What Is Kali NetHunter? A Deep Dive Into the Hackbox for Android

Lesson - 57

A Perfect Guide That Explains the Differences Between a Hub and a Switch

Lesson - 58

The Best Guide to Help You Understand What Is Network Security

Lesson - 59

What Is CIDR? And Its Importance in the Networking Domain

Lesson - 60
What Are Digital Signatures: A Thorough Guide Into Cryptographic Authentication

Document authentication in the digital age is a daunting task, considering the means people have to meddle with data. One can never be sure of the legitimacy of a document they receive unless there is some proof regarding its whereabouts. However, digital signatures have proved a viable alternative in these trying times. Let us cover what are digital signatures in this lesson and go through their importance and applications.

Let's start by learning what digital signatures are from a layman's perspective.

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What Are Digital Signatures?

Digital "fingerprints" and digital signatures both have similar functions. The digital signature that appears as a coded message safely connects a signer to a document in a transaction that is documented. For increased security, digital signatures rely on the Public Key Infrastructure (PKI), a widely acknowledged standard. They fall under the category of electronic signature technology (eSignature).

An electronic signature known as a "digital signature" uses a mathematical formula to regularly verify communication's veracity and integrity (e.g., an email, a credit card transaction, or a digital document). To identify users, preserve the information in digital communications or documents, and guarantee that no information is altered while being transmitted between the signer and the receiver, digital signatures establish a virtual fingerprint that is specific to a certain person or entity. The digital signature in emails includes the entire content as well. Compared to previous types of electronic signatures, digital signatures are much more trustworthy and secure.

Now that we know what digital signatures are, let us go through a detailed explanation of how it's working.

How Do Digital Signatures Work?

The objective of digital signatures is to authenticate and verify documents and data. This is necessary to avoid tampering and digital modification or forgery during the transmission of official documents.

With one exception, they work on the public key cryptography architecture. Typically, an asymmetric key system encrypts using a public key and decrypts with a private key. For digital signatures, however, the reverse is true. The signature is encrypted using the private key and decrypted with the public key. Because the keys are linked, decoding it with the public key verifies that the proper private key was used to sign the document, thereby verifying the signature's provenance.


M - Plaintext

H - Hash function

h - Hash digest 

‘+’ - Bundle both plaintext and digest   

E - Encryption

D - Decryption

The image above shows the entire process, from the signing of the key to its verification. So, go through each step to understand the procedure thoroughly.

  • Step 1: M, the original message is first passed to a hash function denoted by H# to create a digest.

  • Step 2: Next, it bundles the message together with the hash digest h and encrypts it using the sender’s private key.

  • Step 3: It sends the encrypted bundle to the receiver, who can decrypt it using the sender’s public key.
  • Step 4: Once it decrypts the message, it is passed through the same hash function (H#), to generate a similar digest.
  • Step 5: It compares the newly generated hash with the bundled hash value received along with the message. If they match, it verifies data integrity.

Now that we understand the basic working procedure behind digital signatures, let us cover the importance of digital signatures.

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Importance of Digital Signatures

As more business is done online, commitments and transactions formerly written on paper and handed physically are gradually being replaced by digital papers and procedures. When valuable or sensitive data is exchanged, there are frequently bad actors present who seek to steal it or exploit it for their advantage. Businesses must be able to verify and authenticate that these crucial business documents, data, and interactions are trusted and delivered privately to reduce the risk of document manipulation by hostile parties.

Digital signatures safeguard private information without obstructing the efficiency of electronic document workflows; in contrast to traditional procedures, they frequently enhance document management. The use of digital signatures makes document signing straightforward and accessible from any computer or mobile device. Additionally, because the checksum is included in the file, it may be utilized on any device or place the information is transferred. Digitally signed papers are also easy to regulate and keep track of since they provide the status of all paperwork, allow you to see whether they have been signed, and provide an audit trail.

In the next section of our article, we will cover the distinct advantages digital signatures provide in a real-world scenario.

Advantages and Disadvantages of Digital Signatures

  1. Cost Saving: With little to no costs for ink, paper, printing, digitizing, shipping/delivery, or travel, many businesses also see considerable cost reductions. Other indirect expenses like filing, archiving, or tracking are also reduced.

  2. Workflow Efficiency: Digital signatures provide greater process efficiency with fewer delays. It is simpler and takes less time and effort to manage and track papers. Digital signatures have several benefits that make work processes more efficient. For instance, email alerts can serve as a reminder to sign, and status monitoring can provide information about the state of the document.

  3. Time-Saving: Businesses can sign papers and contracts with a single click, saving time and money thanks to digital signatures. When the needed signer is located in a separate region, there are significant time and cost savings. It is possible to sign documents virtually immediately and from anywhere.

  4. Legal Validity: Digital signatures guarantee the signature's veracity and legitimacy. Like any other notarized paper document, this is admissible in any court of law. Audit and compliance are improved and made simpler by time stamping and the capability to monitor and archive documents.
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In this tutorial on 'what are digital signatures,' we cover the basics of a digital signature, its working, importance, and certain benefits over standard paperwork. However, digital signatures are just a fraction of what the cyber security world offers.

The Certified Ethical Hacking Course v11 offered by Simplilearn can help you take the first step in the ethical hacking industry and, subsequently, the cybersecurity domain. From theoretical concepts like Information Security and basic terminology, intricate topics like vulnerability analysis and session hijacking are taught conveniently. With the market looking for more and more trained personnel every day, cybersecurity and ethical hacking have a bright future, and it's highly recommended to get in on the ground floor.

Do you have any doubts about 'what are digital signatures'? Please let us know your queries in the comment box below, and we will get back to you as soon as possible.

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Simplilearn is one of the world’s leading providers of online training for Digital Marketing, Cloud Computing, Project Management, Data Science, IT, Software Development, and many other emerging technologies.

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