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

DSA with LCG nonces

Even we don't know how to solve this one

Solved by 6
Not So Safe Primes

"Generating DH parameters... this is going to take a long time"

Solved by 16
Backdoored PRNG

Exploit a backdoor in an elliptic curve based PRNG

Solved by 17
Bleichenbacher's CCA2 on RSA

A server is giving feedback it's not supposed to. Can you stage an online attack?

Solved by 21
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