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}

Continue reading “nullcon HackIM – 2017 – Crypto 2”