V2a: Symmetric-Key Encryption Fundamentals (Applied Cryptography 101)

Unlock the essential principles of symmetric-key encryption in this introductory video, V2a: Symmetric-key encryption: Fundamental concepts, part of the "Cryptography 101: Building Blocks" course by Alfred MEnezes. Designed for computer science students, security engineers, software engineers, and cybersecurity professionals, this free applied cryptography series delves into state-of-the-art encryption methods and techniques. In this video, we start with basic symmetric-key encryption concepts, exploring foundational ciphers like the simple substitution cipher and the Vigenère cipher. Learn how these early techniques paved the way for modern secure-encryption schemes and understand key adversarial goals and capabilities in the context of cryptographic security. We break down what constitutes a secure-encryption scheme and how it protects against different types of attacks, making complex ideas accessible for those new to cryptography. Perfect for undergraduates and professionals in security-focused fields, this video provides a solid understanding of encryption basics, which will support deeper learning in applied cryptography. Don't forget to subscribe for more free content on cryptographic theory, applied security techniques, and advanced topics in cryptography. Start building a strong foundation in modern encryption today! #Cryptography101 #SymmetricKeyEncryption #SecureEncryption Lecture playlist: https://www.youtube.com/playlist?list=PLA1qgQLL41SRsHMtsb4up5fTytDeHV_yJ Course web page: https://cryptography101.ca/crypto101-building-blocks/ The slides are available on the course web page. Other cryptography courses: https://cryptography101.ca Slides 00:00 Introduction 01:40 Slide 27: Basic concepts 02:44 Slide 28: Using a SKES to achieve confidentiality 05:19 Slide 29: World War II: Enigma machine 06:30 Slide 30: World War II: Lorenz machine 07:42 Slide 31: The simple substitution cipher 09:09 Slide 32: What does it mean for a SKES to be secure? 10:24 Slide 33: Computational power of the adversary 12:01 Slide 34: Adversary's interaction 15:44 Slide 35: Adversary's goal 17:19 Slide 36: Definition of a secure SKES 19:08 Slide 37: Desirable property of a SKES 20:20 Slide 38: Security of the simple substitution cipher 21:35 Slide 39: Security of the simple substitution cipher (2) 22:11 Slide 40: Work factor 23:48 Slide 41: Security level 24:09 Slide 42: Security of the simple substitution cipher (3) 25:13 Slide 43: Polyalphabetic ciphers 26:08 Slide 44: Security of the Vigenere cipher 26:38 Coming up