This is the solution of the challenge “Squaring Off” given during the MCH CTF. It consisted in solving a discrete logarithm of in the multiplicative groups of a the square of a prime.

This is the solution of the challenge “GDBUG” given during the Insomni’hack 2022 CTF. It was a simple serial check algorithm solved with Z3 solver.

This is the solution of the challenge “Reee” given during the PlaidCTF 2020 CTF. It was solved by executing an unscrambling function to get the compare algorithm. Then figure out what the algorithm does to recover the flag.

This is the solution of the challenge “Export” given during the Volga CTF qualifier 2020. It consisted in a key recovery attack of a stream cipher which turn out to be the A5/2 cipher from GSM. Existing attacks applied to recover the secret key.

This is the solution of the challenge “RISC-Y Business” given during the ph0wn 2019 CTF. The goal was to write a shellcode on RISC-V platform to dump the RAM were the flag lies.

Shamir secret sharing scheme. Only the prime number to perform computations is unknown but using anyone allows to recover the secret.