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This course discusses how the poor use of cryptography can leave an application vulnerable to attack and how it can be exploited, as well as potential mitigations.

7 videos  //  40 minutes of training

Course description

Cryptography is a very useful tool. However, it can also be very fragile. A small error in design or implementation can destroy any benefits of using encryption in an application. This course describes some of the common errors that developers make when using cryptography and how to remediate them.

Course syllabus

Introduction to CryptographyDuration: 1:57

This video provides an introduction to the cryptography course.

Introduction to CryptosystemsDuration: 5:47

This video covers the fundamentals of cryptosystems.

Cryptography ErrorsDuration: 9:13

This video describes how cryptography errors can make an application vulnerable to attack.

Cryptography Error ExploitationDuration: 9:04

This video describes how cryptography errors can be exploited by an attacker.

Cryptography Errors Case StudyDuration: 3:54

This video describes a case study of an application that misused cryptography.

Cryptography Error MitigationsDuration: 5:05

This video describes mitigations for common cryptography errors.

Poor Cryptography DemoDuration: 5:00

This video demonstrates exploitation of a cryptography error.

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.