About

Below are some problems related to computer security (specifically poorly implemented security). Do Them. You are free to use any language and environment you like to complete them. The problems require familiarity with programming, but not necessarily with applied cryptography or computer security in general. An understanding of how some of the algorithms and tools in the problems work will be of use, so as a starting point you can find some resources to help you begin here. If this topic is new to you, you may want to start with the Tutorial Problems.

Problems

Monoalphabetic Cipher

Monoalphabetic ciphers leak information. Can you recover it?

Solved by 87
Salt Alone Won't Save You

Salting password hashes is important, but not enough on it's own

Solved by 76
CCA on Textbook RSA

Turns out padding is important

Solved by 75
Bad Entropy

It's easy to generate bad symmetric keys

Solved by 62
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