In this module, you will be able to breakdown how the process of checking inputs, known as validation and verification works. You will be able to avoid and buffer numeric overflows in your programs. You will be able to discover what happens when you call functions with parameters that cause overflows. And finally, you will be able to detect various input injections such as cross-site scripting and SQL injections and be able to describe the consequences of not examining input.

In this module, you will be able to describe how files and subprocesses interact and be able to create subprocesses and shell scripts. You will also be able to identify and prevent race conditions in your programs and practice cleaning out environments to make them safe for untrusted subprocesses.

In this module you will be able to distinguish between pseudo-randomness and actual randomness. You will be able to apply randomness in the coding environment and generate random numbers and look at their distribution. You'll be able to identify and describe how and why cryptography is used, as well as why you should use trusted cryptography code libraries instead of crafting your own solution. You will be able to analyze and consider best practices for handling sensitive information, passwords, crypto keys, how to handle errors in security sensitive programs, and how to defend against string attacks. You will be able to hash a password and then try to guess another one. You will be able to practice cleaning out environments to make them safe for untrusted subprocesses, as well as practice handling integer overflow.