33C3 CTF 2016 – beeblebrox (Crypto 350)

Make bad politicians resign! nc 2048 files Summary: factorization-based attack on a signature method


PlaidCTF 2016 – Radioactive (Crypto 275)

We just got this fancy new cryptographic device and it seems to work great… for the most part. But sometimes the values it gives me are wrong. Maybe you could take a look for me. radioactive.tar.bz2 Summary: fault attack on RSA signature (not RSA-CRT)


PoliCTF 2012 Crypto 100

Since I needed to sign a document I thought about doing it with a Chinese paintbrush… Too bad my hand is not that steady, so just in case, I re-signed it with a common pen. Sadly I keep being forgetful, so I actually forgot where I left the two halves of the sigil I used… Continue reading »


EnoWars CTF – Get On Board (500)

Category: crypto There is also this nice new spaceship in the hangar just waiting for us. Some old-school mobil terminal describes it as: “The Heart of Gold is the sleekest, most advanced, coolest spaceship in the galaxy. “Its stunning good looks mirror its awesome speed and power. It is powered by the revolutionary new Infinite… Continue reading »