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  • PwnThyBytes CTF 2019 – Wrong Ring (Crypto)

    Is post quantum cryptography too complex for you? wrong_ring.sage Summary: Ring-LWE with small error, hidden under a number field

  • 1st Crypto CTF 2019 – Least Solved Challenges

    Brief solution ideas to the least solved Crypto CTF challenges.

  • CyBRICS CTF 2019 — we’re making a full-fledged one!

    We, in SPbCTF meetups crew (guys from LC↯BC, SiBears, PeterPEN, Yozik), were invited to make a CTF together with some BRICS countries universities. So we made one — and invite everyone to compete, have fun and win some prizes in CyBRICS CTF 2019. This one continues the tradition of hack you events, but this time… Continue reading »

  • SECT CTF 2018 :: Gh0st

    Original Description: Gh0st – Pwn (468) Yikes, one of our finest cyberwarrior plugged into the wrong system. His mind is stuck in the kernel. Bring a plunger and your finest kernel exploit Service: nc 142.93.38.98 6666 | nc pwn.sect.ctf.rocks 6666 Download: gh0st.tar.gz Author: likvidera Summary: linux kernel exploitation using an out-of-bounds kernel memory write.

  • Midnight CTF 2018 Finals – Snurre128

    In this challenge we have a stream cipher based on LFSR and nonlinear filtering function. It has 128-bit LFSR secret state and we are also given 1600 keystream bits. Our goal is simply to recover the key which is the initial state. Here is the nonlinear filtering function: f(v) = v[0] ^ v[1] ^ v[2]… Continue reading »

  • 0CTF 2018 Quals – zer0C5 (Crypto 785)

    0ops Cipher 4, hope you enjoy it:) zer0C4.zip nc 202.120.7.220 1234 Summary: related-key attack on weakened variant of RC4

  • 0CTF 2018 Quals – zer0SPN (Crypto 550)

    0ops SPN, hope you enjoy it:) zer0SPN.zip Summary: linear cryptanalysis on toy block cipher

  • 0CTF 2018 Quals – zer0TC (Crypto 916)

    0ops Toy Cipher, hope you enjoy it:) zer0TC.zip Summary: meet-in-the-middle and key-schedule constraints

  • hack you ’17 :: easy CTF on Oct 8—14

    As a tradition, every fall we host a fun lightweight Jeopardy CTF for our freshmen to attract them into all the CTFey goodness. This one will be our fifth year (holy shit!) We invite everyone to check out hack you ’17 this year. Just as always, two separate scoreboards: one for SPbCTF meetups, one for… Continue reading »

  • TWCTF 2017 – Solutions for BabyPinhole, Liar’s Trap, Palindrome Pairs Challenge

    Scripts with short explanations: BabyPinhole (crypto 163) Liar’s Trap (crypto/ppc 281) Palindrome Pairs – Challenge Phase (ppc 63+337)

  • Polictf 2017 – Lucky Consecutive Guessing (Crypto)

    We implemented a random number generator. We’ve heard that rand()’s 32 bit seeds can be easily cracked, so we stayed on the safe side. nc lucky.chall.polictf.it 31337 chall.py Summary: breaking truncated-to-MSB LCG with top-down bit-by-bit search.

  • Google CTF 2017 Quals – BLT (Bleichenbacher’s Lattice Task – Insanity Check)

    A slow descent into the dark, into madness, futility, and despair. BLT.jar (not necessary) STDOUT Flag.java Summary: DSA with short secrets, lattice + meet-in-the-middle attack.

  • Google CTF 2017 Quals – Crypto writeups

    Scripts with short explanations for all crypto tasks (except RSA) from Google CTF Quals 2017: Crypto Backdoor Introspective CRC Shake It RSA CTF Challenge (no writeup, but I think it’s similar to this old one) Rubik Bleichenbacher’s Lattice Task (full writeup here)

  • 0CTF 2017 Quals – Zer0llvm

    Talent Yang loves to customize his own obfuscator. Unfortunately, he lost his seed when he was watching Arsenal’s UEFA game. What a sad day! His team and his seed were lost together. To save him, could you help him to get back his seed? We can not save the game, but we may be able… Continue reading »

  • 0CTF 2017 Quals – OneTimePad 1 and 2

    I swear that the safest cryptosystem is used to encrypt the secret! oneTimePad.zip Well, maybe the previous one is too simple. So I designed the ultimate one to protect the top secret! oneTimePad2.zip Summary: breaking a linear and an LCG-style exponential PRNGs.

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