This vulnerability exploits a weakness in the construction of the public key that allows the private key to be recovered by factorizing the modulus.
ROCA is the acronym of “Return of Coppersmith’s Attack”. This vulnerability was discovered in February 2017 by a team of Czech researchers and was given the identifier CVE 2017-15361.
Continue readingIt’s been a long time for both of us since part 3 of this series. So to quietly resume our journey in the beautiful world of mathematics I propose you 4 rather simple topics :
Today the focus is on oracles ! You already encountered the decipher oracle in part 1 but now you’ll meet :
Before diving right into more advanced attacks, let’s take a minute to do a quick recap because it’s been a long time since the last part. Once your mind is warmed up you can safely move on.
On the program today you have :
Spoiler: There will be Maths 😉
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RSA is my favorite cryptosystem. 🙂 It’s simple and powerful.
In this series I will try to go through every attacks (that I’m aware of) against RSA which are useful for solving CTF tasks.
I’m not going to give you scripts that will do all the work for you but rather explain how the attacks work. The aim of this series is to understand the attacks you use and which one is most appropriate depending on the task. I will try to be beginner friendly and repeat myself in the beginning but afterwards I will assume that the reader has learnt the concepts. Continue reading
