University of Colorado System

Symmetric Cryptography

This course is part of multiple programs.

Taught in English

Some content may not be translated

Sang-Yoon Chang

Instructor: Sang-Yoon Chang

14,340 already enrolled

Included with Coursera Plus

Course

Gain insight into a topic and learn the fundamentals

4.5

(248 reviews)

|

87%

Intermediate level
Some related experience required
12 hours (approximately)
Flexible schedule
Learn at your own pace

Details to know

Shareable certificate

Add to your LinkedIn profile

Assessments

10 quizzes

Course

Gain insight into a topic and learn the fundamentals

4.5

(248 reviews)

|

87%

Intermediate level
Some related experience required
12 hours (approximately)
Flexible schedule
Learn at your own pace

See how employees at top companies are mastering in-demand skills

Placeholder

Build your subject-matter expertise

This course is available as part of
When you enroll in this course, you'll also be asked to select a specific program.
  • Learn new concepts from industry experts
  • Gain a foundational understanding of a subject or tool
  • Develop job-relevant skills with hands-on projects
  • Earn a shareable career certificate
Placeholder
Placeholder

Earn a career certificate

Add this credential to your LinkedIn profile, resume, or CV

Share it on social media and in your performance review

Placeholder

There are 5 modules in this course

This module defines substitution cipher technique and describes multiple examples for substitution-based classical algorithms: Caesar Cipher, Monoalphabetic Cipher, and Vigenere Cipher (which is a type of Polyalphabetic Cipher). We will also discuss the mathematical concepts in Modulo Operations to use them to describe the cipher algorithms.

What's included

8 videos4 readings3 quizzes1 peer review

This module studies transposition cipher which, along with substitution cipher, provides a base technique for symmetric ciphers. We define transposition cipher and product cipher and discuss transposition examples in Rail Fence and Permutation Cipher.

What's included

5 videos1 reading2 quizzes

This module is about modern ciphers based on product ciphers. We will first define block cipher and contrast it with stream cipher. We will then describe the ideal block cipher, which maximizes the number of transformations, and Feistel Cipher, which is a practical structure framework approximating the ideal block cipher. As a widely used cipher example based on the Feistel Cipher structure; we will study Data Encryption Standard (DES).

What's included

8 videos2 readings2 quizzes1 peer review

To provide stronger security than DES, modern symmetric ciphers can either use multiple ciphers or use an entirely different algorithm. This module reviews examples of each in Triple-DES and AES.

What's included

4 videos2 readings2 quizzes

Given a cipher and a key, this module reviews how to use block cipher operation modes when the data spans across multiple blocks. The module describes five popular operation modes: ECB, CBC, CFB, OFB, and CTR mode.

What's included

6 videos1 reading1 quiz1 peer review

Instructor

Instructor ratings
4.3 (52 ratings)
Sang-Yoon Chang
University of Colorado System
6 Courses49,669 learners

Offered by

Recommended if you're interested in Computer Security and Networks

Why people choose Coursera for their career

Felipe M.
Learner since 2018
"To be able to take courses at my own pace and rhythm has been an amazing experience. I can learn whenever it fits my schedule and mood."
Jennifer J.
Learner since 2020
"I directly applied the concepts and skills I learned from my courses to an exciting new project at work."
Larry W.
Learner since 2021
"When I need courses on topics that my university doesn't offer, Coursera is one of the best places to go."
Chaitanya A.
"Learning isn't just about being better at your job: it's so much more than that. Coursera allows me to learn without limits."

Learner reviews

Showing 3 of 248

4.5

248 reviews

  • 5 stars

    71.77%

  • 4 stars

    18.54%

  • 3 stars

    4.43%

  • 2 stars

    2.82%

  • 1 star

    2.41%

SB
4

Reviewed on Nov 29, 2020

HM
5

Reviewed on Sep 20, 2021

DL
5

Reviewed on Aug 3, 2020

New to Computer Security and Networks? Start here.

Placeholder

Open new doors with Coursera Plus

Unlimited access to 7,000+ world-class courses, hands-on projects, and job-ready certificate programs - all included in your subscription

Advance your career with an online degree

Earn a degree from world-class universities - 100% online

Join over 3,400 global companies that choose Coursera for Business

Upskill your employees to excel in the digital economy

Frequently asked questions