Basic Cryptography and Programming with Crypto API

University of Colorado System via Coursera

Go to Course: https://www.coursera.org/learn/basic-cryptography-and-crypto-api

Introduction

**Course Review: Basic Cryptography and Programming with Crypto API on Coursera** In today's digital world, where data security is paramount, understanding cryptography has never been more important. The course "Basic Cryptography and Programming with Crypto API," available on Coursera, offers an excellent introduction to the fascinating field of cryptography, providing practical knowledge that can be applied in various tech domains. Here's an in-depth look at the course, its content, and why I highly recommend it to anyone interested in the field. ### Course Overview This MOOC (Massive Open Online Course) covers fundamental concepts and principles of cryptography. It effectively combines theory with practical elements, such as cryptoanalysis, symmetric and asymmetric cryptography, and programming with the Crypto API. Throughout the course, learners will delve into topics such as mono-alphabetic substitution ciphers, the robust one-time pad encryption method, and quantum key distribution systems. The curriculum is structured to guide beginners through the essentials of cryptography and its applications in real-world programming scenarios. ### Detailed Syllabus Breakdown 1. **Basic Cryptography** - This module lays the foundation of cryptography by introducing its fundamental principles. You'll engage with the concepts of cryptanalysis, specifically learning how to decrypt messages using mono-alphabetic substitution ciphers. Additionally, the module discusses advanced topics like the one-time pad and quantum key distribution, preparing learners for more complex cryptographic techniques. 2. **Symmetric Key Cryptography** - Here, participants delve into the mechanics of symmetric key algorithms, focusing on the Data Encryption Standard (DES) and the Advanced Encryption Standard (AES). This module presents the criteria for selecting AES and explains different block cipher operating modes. You will also learn about preventing and detecting block swapping and replay attacks, which is crucial for securing data transmission. 3. **Asymmetric Key Cryptography** - This segment introduces modular arithmetic and the Euler Totient Theorem, leading to a comprehensive study of the RSA asymmetric encryption algorithm. The module includes practical exercises using OpenSSL to perform basic RSA operations and explores the Diffie-Hellman key exchange protocol, which is fundamental for secure session key generation. 4. **Develop Secure Programs with Crypto API** - In the final module, students learn to write secure applications using the Crypto API. You'll engage in practical exercises involving encrypting and decrypting documents, as well as signing and verifying documents. A noteworthy project includes enhancing a website's registration process to ensure email ownership verification, providing hands-on experience in securing user data in real-world applications. ### Recommendation This course is highly recommended for those looking to build a strong foundation in cryptography. Whether you're a student in computer science, a software developer, or a tech enthusiast wanting to expand your skill set, this course offers valuable insights and skills that are applicable in various domains, from secure web development to implementing robust data protection measures. ### Learning Experience The course is well-structured, with clear explanations and engaging exercises. The blend of theoretical concepts and practical application solidifies understanding and encourages learners to experiment with cryptographic techniques. The hands-on projects not only reinforce learning but also improve programming skills, particularly for those using the Crypto API—a relevant skill set in today's cybersecurity landscape. ### Conclusion "Basic Cryptography and Programming with Crypto API" is a comprehensive introduction to the essential elements of cryptography and its applications in programming. By enrolling in this course, you will equip yourself with the knowledge and skills necessary to navigate the complexities of data security. With positive reviews from past students highlighting the clarity of instruction and practical relevance, this course is indeed a worthwhile investment in your professional development. If you’re serious about understanding cryptography and want to implement it in real-world scenarios, I cannot recommend this course highly enough. Don’t miss out on the opportunity to enhance your tech toolkit!

Syllabus

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.

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.

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.

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.