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Symmetric Cryptography
  • Level Professional
  • Duration 13 hours
  • Course by University of Colorado System
  • Offered by

About

Welcome to Symmetric Cryptography! Symmetric cryptography relies on shared secret key to ensure message confidentiality, so that the unauthorized attackers cannot retrieve the message. The course describes substitution and transposition techniques, which were the bases for classical cryptography when the message is encoded in natural language such as English. Then, we build on product ciphers (using both substitution and transposition/permutation) to describe modern block ciphers and review the widely used cipher algorithms in DES, 3-DES, and AES. Lastly, we enable the use of block ciphers to support variable data length by introducing different modes of block cipher operations in ECB, CBC, CFB, OFB, and CTR modes. This course is cross-listed and is a part of the two specializations, the Applied Cryptography specialization and the Introduction to Applied Cryptography specialization.

Modules

Instructor Introduction and Module Objectives

    • 2 Videos
    • 1 Readings
Show info about module content

2 Videos

  • Instructor Introduction
  • Module Objectives

1 Readings

  • Get help and meet other learners. Join your Community!

Alphabet

    • 1 Videos
Show info about module content

1 Videos

  • Alphabet

Substitution Cipher

    • 1 Videos
    • 1 Assignment
Show info about module content

1 Assignment

  • Caesar Cipher

1 Videos

  • Substitution and Caesar Cipher

Modulo Operation

    • 1 Videos
    • 1 Readings
    • 1 Assignment
Show info about module content

1 Assignment

  • Modulo Operation and Caesar Cipher

1 Videos

  • Modulo Operation

1 Readings

  • Get help and meet other learners in this course. Join your discussion forums!

Monoalphabetic Cipher

    • 1 Videos
Show info about module content

1 Videos

  • Monoalphabetic Cipher

Natural Language Redundancy

    • 1 Videos
Show info about module content

1 Videos

  • Natural Language Redundancy

Polyalphabetic Cipher

    • 1 Videos
    • 1 Readings
    • 1 Assignment
Show info about module content

1 Assignment

  • Vigenere Cipher

1 Videos

  • Polyalphabetic Cipher and Vigenere Cipher

1 Readings

  • Lecture Slides for Classical Cipher - Substitution

Pseudo-Code: Vigenere Cipher

    • 1 Readings
    • 1 PeerReview
Show info about module content

1 Peer Review

  • Pseudo-Code: Vigenere Cipher

1 Readings

  • About Pseudocode

Module Objectives

    • 1 Videos
Show info about module content

1 Videos

  • Module Objectives

Rail Fence Cipher

    • 1 Videos
Show info about module content

1 Videos

  • Rail Fence Cipher

Permutation Cipher

    • 2 Videos
    • 1 Assignment
Show info about module content

1 Assignment

  • Rail Fence Cipher and Permutation Cipher

2 Videos

  • Permutation Cipher
  • Permutation Cipher Security

Product Cipher

    • 1 Videos
    • 1 Readings
    • 1 Assignment
Show info about module content

1 Assignment

  • Product Cipher

1 Videos

  • Product Cipher

1 Readings

  • Lecture Slides for Classical Cipher - Transposition

Modern Cipher and Module Objectives

    • 1 Videos
Show info about module content

1 Videos

  • Modern Cipher and Module Objectives

Modern Cipher and Block Cipher (vs. Stream Cipher)

    • 1 Videos
Show info about module content

1 Videos

  • Block Cipher vs. Stream Cipher

Ideal Block Cipher

    • 1 Videos
    • 1 Assignment
Show info about module content

1 Assignment

  • Ideal Block Cipher

1 Videos

  • Ideal Block Cipher

Feistel Cipher

    • 1 Videos
Show info about module content

1 Videos

  • Feistel Cipher

Data Encryption Standard (DES)

    • 4 Videos
    • 2 Readings
    • 1 PeerReview
    • 1 Assignment
Show info about module content

1 Assignment

  • DES

1 Peer Review

  • DES Overview Pseudo-Code

4 Videos

  • DES Overview
  • DES Round Function
  • DES Subkey Generation
  • DES Security

2 Readings

  • About Pseudocode
  • Lecture Slides for Block Cipher and DES

Module Objectives

    • 1 Videos
Show info about module content

1 Videos

  • Module Ojectives

Double-DES and Meet-in-the-Middle Attack

    • 1 Videos
Show info about module content

1 Videos

  • Double-DES and Meet-in-the-Middle Attack

Triple DES

    • 1 Videos
    • 1 Assignment
Show info about module content

1 Assignment

  • 3-DES and 4-DES

1 Videos

  • Triple DES

Advanced Encryption Standard (AES)

    • 1 Videos
    • 2 Readings
    • 1 Assignment
Show info about module content

1 Assignment

  • AES

1 Videos

  • Advanced Encryption Standard (AES)

2 Readings

  • Lecture Slides for 3-DES and AES
  • Symmetric Algorithm Survey

Module Objectives

    • 1 Videos
Show info about module content

1 Videos

  • Module Objectives

Electronic Codebook (ECB) Mode

    • 1 Videos
Show info about module content

1 Videos

  • Electronic Codebook (ECB)

Cipher Block Chaining (CBC) Mode

    • 1 Videos
Show info about module content

1 Videos

  • Cipher Block Chaining (CBC)

Cipher Feedback (CFB) Mode

    • 1 Videos
Show info about module content

1 Videos

  • Cipher Feedback (CFB)

Output Feedback (OFB) Mode

    • 1 Videos
Show info about module content

1 Videos

  • Output Feedback (OFB)

Counter (CTR) Mode

    • 1 Videos
Show info about module content

1 Videos

  • Counter (CTR)

Block Cipher Operation Modes

    • 1 Readings
    • 1 Assignment
Show info about module content

1 Assignment

  • Block Cipher Operation Modes

1 Readings

  • Lecture Slides for Block Cipher Operation Modes

Real-World Use of Block Cipher Operation Mode

    • 1 PeerReview
Show info about module content

1 Peer Review

  • Real-world use of block cipher operation mode

Auto Summary

Dive into the world of Symmetric Cryptography, an essential course in the IT & Computer Science domain, offered by Coursera. Designed for professionals, this course unravels the intricacies of symmetric cryptography, emphasizing the importance of a shared secret key in safeguarding message confidentiality against unauthorized access. Throughout this comprehensive 780-minute course, learners will explore foundational techniques such as substitution and transposition that underpin classical cryptography. Progressing to modern applications, the course delves into product ciphers and critically acclaimed block ciphers, including DES, 3-DES, and AES. Additionally, it covers various modes of block cipher operations, such as ECB, CBC, CFB, OFB, and CTR, to handle variable data lengths effectively. Symmetric Cryptography is a key component of two specializations: Applied Cryptography and Introduction to Applied Cryptography, making it a valuable learning path for those looking to deepen their expertise in the field. With a Starter subscription plan, this professional-level course is tailored for individuals eager to enhance their cryptographic skills and apply them in real-world scenarios.

Sang-Yoon Chang
Instructor

Sang-Yoon Chang