Symmetric Cryptography

This course provides an introduction to symmetric encryption algorithms.
46 minutes 6 videos

Course description

Symmetric cryptography is one of the two major classifications of cryptographic algorithms. This course describes the main features of a symmetric algorithm and the two main subcategories of symmetric ciphers: block and stream. AES and RC4 are discussed as common examples of a block and a stream cipher.


Rivest Cipher 4 (RC4)

Video - 00:05:00

This video introduces RC4 and its security.
Stream Ciphers

Video - 00:06:00

This video introduces stream ciphers, the one-time pad and bit-flipping attacks.
The Advanced Encryption Standard (AES)

Video - 00:12:00

This video provides an introduction to the AES and its security.
Block Ciphers

Video - 00:15:00

This video introduces block ciphers and block cipher modes of operations.
Fundamentals of Symmetric Cryptography

Video - 00:05:00

This video describes symmetric ciphers and the main classifications of symmetric ciphers.
Course Introduction

Video - 00:02:00

This video introduces the Symmetric Cryptography course.

Meet the author

Howard Poston is a copywriter, author, and course developer with experience in cybersecurity and blockchain security, cryptography, and malware analysis. He has an MS in Cyber Operations, a decade of experience in cybersecurity, and over five years of experience as a freelance consultant providing training and content creation for cyber and blockchain security. He is also the creator of over a dozen cybersecurity courses, has authored two books, and has spoken at numerous cybersecurity conferences. He can be reached by email at or via his website at

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