Nuit du Hack XV – 2017 – No Pain No Gain

Here is how to resolve the challenge “No Pain No Gain” provided, during a CTF, by Nuit du Hack XV between the 31st of March 2017 to the 1st of April 2017:

Nuit du Hack XV - No Pain No Gain
Nuit du Hack XV – No Pain No Gain

As you can see, you need to upload a CSV file formatted as provided by the Web Application (see the picture above).

First of all, you need to create your CSV file and after that, upload it and check the result that you get from the Web Application.

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nullcon HackIM – 2017 – Crypto 1

Here is how to resolve the challenge “Breaking Brain” provided, during a CTF, by nullcon HackIM in February 2017. I took me more time than the Crypto 2… but I got it!

nullcon HackIM – 2017 – cryptopuzzle1
nullcon HackIM – 2017 – cryptopuzzle1

Very interesting challenge! I learned a lot about Bitcoin and the way they generate an address from a passphrase.

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nullcon HackIM – 2017 – Crypto 2

Here is how to resolve the challenge “Breaking Bad Key Exchange” provided, during a CTF, by nullcon HackIM in February 2017:

cryptopuzzle2
nullcon HackIM – 2017 – cryptopuzzle2

Hint 1 : in the range (1 to g*q), there are couple of pairs yielding common secrete as 399.
Hint 2 : ‘a’ and ‘b’ both are less than 1000

Flag Format: flag{a,b}

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