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Symmetric Cryptography

This course provides an introduction to symmetric encryption algorithms.

6 videos  //  46 minutes of training

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.

Course syllabus

Course IntroductionDuration: 1:36

This video introduces the Symmetric Cryptography course.

Fundamentals of Symmetric CryptographyDuration: 5:02

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

Block CiphersDuration: 15:13

This video introduces block ciphers and block cipher modes of operations.

The Advanced Encryption Standard (AES)Duration: 12:26

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

Stream CiphersDuration: 6:10

This video introduces stream ciphers, the one-time pad and bit-flipping attacks.

Rivest Cipher 4 (RC4)Duration: 5:10

This video introduces RC4 and its security.

Meet the author

Howard Poston


Howard Poston is a cybersecurity researcher with a background in blockchain, cryptography and malware analysis. He has a master's degree in Cyber Operations from the Air Force Institute of Technology and two years of experience in cybersecurity research and development at Sandia National Labs.

He currently works as a freelance consultant providing training and content creation for cyber and blockchain security. He can be reached by email at or via his website at

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Plans and pricing





$599 / license

Annually. Includes all content plus team admin and reporting.