About this course: In this MOOC, we will learn the basic concepts and principles of crytography, apply basic cryptoanalysis to decrypt messages encrypted with mono-alphabetic substitution cipher, and discuss the strongest encryption technique of the one-time-pad and related quantum key distribution systems. We will also learn the efficient symmetric key cryptography algorithms for encrypting data, discuss the DES and AES standards, study the criteria for selecting AES standard, present the block cipher operating modes and discuss how they can prevent and detect the block swapping attacks, and examine how to defend against replay attacks. We will learn the Diffie-Hellman Symmetric Key Exchange Protocol to generate a symmetric key for two parties to communicate over insecure channel. We will learn the modular arithmetic and the Euler Totient Theorem to appreciate the RSA Asymmetric Crypto Algorithm, and use OpenSSL utility to realize the basic operations of RSA Crypto Algorithm. Armed with these knowledge, we learn how to use PHP Crypto API to write secure programs for encrypting and decrypting documents and for signing and verify documents. We then apply these techniques to enhance the registration process of a web site which ensures the account created is actually requested by the owner of the email account.
Created by: University of Colorado System
Taught by: Edward Chow, Professor
Computer Science
| Basic Info | Course 2 of 4 in the Fundamentals of Computer Network Security Specialization |
| Level | Intermediate |
| Language | English |
| How To Pass | Pass all graded assignments to complete the course. |
Syllabus
WEEK 1
Basic Cryptography
In this module we learn the basic concepts and principles of crytography, introduce the basic concept of cryptoanalysis using mono-alphabetic substitution cipher as an example, and discuss the one-time-pad and quantum key distribution concepts.
6 videos, 5 readings
- Video: Course Overview
- Video: Basic Cryptography
- Reading: Introduction to cryptology, Part1, from IBM developerWorks
- Video: Kerckhoff's Principle
- Reading: What makes a cryptographic protocol strong?
- Video: CryptoAnalysis of Monoalphabetic Substitution Cipher
- Reading: Basic Cryptoanalysis. Three Basic Variations of Cryptoanalysis or Cipher Attack:
- Video: Columnar Transposition Ciphers
- Reading: Columnar transposition Ciphers
- Video: One-Time Pad & Quantum Key Distribution
- Reading: One time pad encryption
- Discussion Prompt: Discussion Topic
Graded: Exam 2.1
WEEK 2
Symmetric Key Cryptography
In this module we present the basic mechanism of symmetric key crytography algorithms, discuss the DES and AES standard, describe the criteria for selecting AES standard, present the block cipher operating modes and discuss how the block swapping attacks and replay attacks can be prevented and detected.
6 videos, 5 readings
- Video: Symmetric Key Algorithm
- Reading: Symmetric Key Encryption and DES
- Video: Advanced Encryption Standard
- Reading: AES: The Advanced Encryption Standard by Avi Kak
- Video: AES Expansion/Schedule
- Reading: Section 8.8 Key Expansion Algorithm from Prof. Section 8.8 Key Expansion Algorithm Lecture Note
- Video: AES Selection Criteria
- Reading: Report on the Development of the Advanced Encryption Standard (AES)
- Video: Dealing with Block Swapping and Replay Attacks
- Video: Block Cipher Mode of Operation
- Reading: Block cipher mode of operation
Graded: Project 2a. Using OpenSSL to encrypt/decrypt data
Graded: Exam 2.2. Symmetric Key Algorithm
WEEK 3
Asymmetric Key Cryptography
In this module we will learn the modular arithmetic, the Euler Totient Theorm, the RSA Asymmetric Crypto Algorithm, use OpenSSL to realize the basic operations of RSA Crypto Algorithm, and Diffie-Hellman Symmetric Key Exchange Protocol to derive session keys.
5 videos, 5 readings
- Video: Diffie-Hellman Symmetric Key Exchange Protocol
- Reading: Diffie-Hellman Key Exchange Protocol
- Video: Modular Arithmetic
- Reading: Modular Arithemetic
- Video: Euler Totient Theorem
- Reading: Euler's Totient Theorem
- Video: RSA Asymmetric Crypto Algorithm
- Reading: RSA Cryptosystem
- Video: Understanding RSA with OpenSSL
- Reading: OpenSSL Command-Line HOWTO
Graded: Project 2b. Decipher the message encrypted with shared key established by the Diffie-Hellman Key Exchange Protocol
Graded: Exam 2.3. Asymmetric Key Cryptography
WEEK 4
Develop Secure Programs with Crypto API
In this module, we learn how to use Crypto API to write secure programs for encrypting and decrypting documents, and for signing and verify documents. We then apply the techniques to enhance the registration process of a web site which ensures the account created is actually belonging to the owner of the email account the request profile.
3 videos, 3 readings
- Video: Use Crypto API to Encrypt and Decrypt
- Reading: PHP encrypt and decrypt crypto api
- Video: Use Crypto API to Sign and Verify
- Reading: PHP Openssl sign and verify API
- Video: Mini Capstone: Enhance Registration Web Site Security
- Reading: Ashley Madison Case
Graded: Exam 2.4. Develop Secure Programs with Crypto API
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| Purchase Course | Audit | |
|---|---|---|
| Access to course materials | Available | Available |
| Access to graded materials | Available | Not available |
| Receive a final grade | Available | Not available |
| Earn a shareable Course Certificate | Available | Not available |
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