Overview

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Learn how to apply and analyze cryptographic systems using Python through practical, case-based implementation. This course guides you from foundational cryptography concepts and simple reverse and Caesar ciphers to brute force attacks, transposition ciphers, and classical multiplicative and affine encryption. You’ll develop Python programs for encryption and decryption, automate English detection, apply modular arithmetic, generate cipher keys, and examine how attackers exploit patterns and weaknesses. You’ll also implement substitution, Vernam, and Vigenère ciphers while evaluating their cryptographic strength and susceptibility to cryptanalysis. The course then introduces modern cryptography, including Base64 encoding, hashing algorithms, cryptographic libraries, and RSA public-key cryptography. You’ll distinguish encoding from encryption, apply hashing for data security, and construct and validate RSA key pairs for secure message exchange. Designed for learners interested in Python programming, cryptography, and secure communication, this course uniquely connects cryptographic theory with hands-on case studies. By the end, you’ll be able to build encryption and decryption tools, analyze cipher vulnerabilities, compare classical and modern techniques, and implement cryptographic methods in Python. Enroll to develop practical skills in designing, testing, and evaluating secure communication systems.

Syllabus

Foundations of Cryptography with Python
- This module introduces the fundamental concepts of cryptography and explains the importance of using Python as a tool to implement and explore basic cipher techniques. Learners will gain an understanding of how cryptography works and begin experimenting with simple encryption schemes.
Brute Force and Transposition Ciphers
- This module explores brute force attacks and introduces transposition ciphers. Learners will understand the mechanisms behind these techniques, implement encryption and decryption programs, and analyze cipher weaknesses through automated English detection.
Classical and Affine Ciphers
- This module delves into classical encryption methods including the multiplicative and affine ciphers. Learners will build modular arithmetic utilities, encrypt and decrypt messages, and evaluate cryptographic strength based on key structure and inverses.
Substitution, Vernam & Vigenère Ciphers
- This module focuses on more complex symmetric encryption techniques such as substitution, Vernam (one-time pad), and Vigenère ciphers. Learners will implement and test these ciphers, and understand their cryptographic strength and vulnerabilities.
Modern Cryptography & RSA Implementation
- This module transitions to modern cryptographic techniques including Base64 encoding, hashing algorithms, and public-key cryptography using RSA. Learners will implement secure communication protocols, work with key generation, and understand the mathematics behind prime factorization and encryption algorithms.