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Understanding Cryptography and Its Role in Digital Communications

Learn more about cryptography and cryptographic methods including cyphers, the probability space, and more.

Network and Security
Free Course
This free cryptography course will introduce you to cryptography by teaching you about ancient cyphers. In this course you will learn about the vital role of randomness in cryptographic methods with clear and easy to understand practical examples. You will also study the role of key scientists such as John von Neumann, a physicist who is known as the last representative of the great mathematicians, and a whole lot more!
  • Duration

    1-2 Hours
  • Assessment

    Yes
  • Certification

    Yes
  • Publisher

    Khan Academy

Description

Modules

Outcome

Certification

View course modules

Description

Cryptography plays a vital role in modern digital communication systems. With this course, you will learn how cryptographic methods allow the encryption and decryption of messages sent across digital communication networks. You will study the use of cyphers, the probability space, the Caesar Cipher which is one of the simplest and most widely known encryption techniques, and the Polyalphabetic Cipher which is a cypher that is based on substitution using multiple substitution alphabets.

You will then look into the one-time pad which is an encryption technique that cannot be cracked, but requires a one-time pre-shared key of the same size as, or longer than, the message being sent. This course will also discuss Claude Shannon's Perfect Secrecy, the Fundamental Theorem of Arithmetic, RSA Encryption, and Euler's Totient Phi Function. You will also delve into the WW2 Enigma Machine which is an encryption device developed and used in the early- to mid-20th century, and more!

Cryptography is the process of converting ordinary plain text into unintelligible text and vice-versa using different encryption methods. Upon the completion of this course, you will have a better understanding of the use of cyphers and the role of randomness in encryption. You will also gain better insight into the development of RSA encryption, the Diffie-Hellman Key Exchange, and more. Sign up for this course today and start learning more about cryptography and its role in today's digital communication networks.

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Learning Outcomes

Having completed this course learners will be able to: - Describe the use of ciphers; - Explain the role of randomness in encryption; - Explain the development of RSA encryption.

Certification

All Alison courses are free to enrol, study and complete. To successfully complete this Certificate course and become an Alison Graduate, you need to achieve 80% or higher in each course assessment. Once you have completed this Certificate course, you have the option to acquire an official Certificate, which is a great way to share your achievement with the world. Your Alison Certificate is:

Ideal for sharing with potential employers - include it in your CV, professional social media profiles and job applications
An indication of your commitment to continuously learn, upskill and achieve high results
An incentive for you to continue empowering yourself through lifelong learning

Alison offers 3 types of Certificates for completed Certificate courses:

Digital Certificate - a downloadable Certificate in PDF format, immediately available to you when you complete your purchase
Certificate - a physical version of your officially branded and security-marked Certificate, posted to you with FREE shipping
Framed Certificate - a physical version of your officially branded and security-marked Certificate in a stylish frame, posted to you with FREE shipping

All Certificates are available to purchase through the Alison Shop. For more information on purchasing Alison Certificates, please visit our FAQs. If you decide not to purchase your Alison Certificate, you can still demonstrate your achievement by sharing your Learner Record or Learner Achievement Verification, both of which are accessible from your Dashboard. For more details on our Certificate pricing, please visit our Pricing Page.

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