Ctf Alternatives

ctf reviews and mentions

• Audio Steganography
  1 project | /r/securityCTF | 18 Dec 2022

  Audio can contain dial tones, or it can contain binary/morse code on some particular frequency, or it's not really "audio" but radio-transmission which needs to be decoded, or the audio can contain sounds of keyboard typing or even 3d printer head moving (like https://github.com/p4-team/ctf/tree/master/2020-05-10-spam-and-flags-teaser/3d_printer ), or maybe audio has multiple sources interleaved and you need to separate them and one has the flag, or maybe the audio file itself has specific format and some information can be passed there. There are infinite possibilities and it's impossible to say anything without analysing the file.

• Failing to understand a flag
  1 project | /r/securityCTF | 18 Nov 2022

  It's hard to say anything without actually seeing the page. Was there something inside the CSS files? You can do some crazy stuff there :) You can also do some fancy stuff like bypassing CSRF with CSS injection like in: https://github.com/p4-team/ctf/tree/master/2018-01-20-insomnihack/web_css

• CTF Question - reverse engineering keyboard Morse code
  1 project | /r/securityCTF | 18 Oct 2022
• Question about ECDSA
  2 projects | /r/cryptography | 24 Jun 2022
• Stuck on a forensics challenge
  1 project | /r/CTFlearn | 23 Jun 2022

  One thing that immediately comes into mind is that archives are "weird", and an archive file can be also a totally different type of file at the same time. Just to clarify what I mean see: https://github.com/p4-team/ctf/blob/master/2016-04-15-plaid-ctf/web_pixelshop/README.md and specifically the magic file https://github.com/p4-team/ctf/blob/master/2016-04-15-plaid-ctf/web_pixelshop/exploit.png this is totally valid PNG file but at the same time it's also totally valid ZIP file with PHP shell inside.

• Initial impact report about this week's EdDSA Double-PubKey Oracle attack in 40 affected crypto libs
  6 projects | /r/crypto | 18 Jun 2022

  Funny part is that even in CTF challenges made around this problem challenge authors were introducing some intentional bugs to account for this scenario, because they thought it would be too unrealistic otherwise :D See for example: https://github.com/p4-team/ctf/tree/master/2018-12-08-hxp/crypto_uff

• Reduced Round AES CTR Attacks
  2 projects | /r/cryptography | 7 Apr 2022

  See: https://github.com/p4-team/ctf/tree/master/2016-03-12-0ctf/peoples_square and also https://github.com/TFNS/writeups/tree/master/2020-06-05-DefenitCTF/spn (this one is not AES but some toy SPN, but the idea is exactly the same and maybe easier to understand)

• Hey I was wondering if anyone knew a good place to post a challenge, a challenge with a reward
  1 project | /r/cryptography | 20 Nov 2021

  If it's some serious interesting cryptography (just to give you an example: https://github.com/p4-team/ctf/tree/master/2019-11-02-google-ctf/fractorization ), then perhaps consider talking to some CTF team to feature your challenge during an upcoming CTF

• Help with factorizing n=p*q in an vulnerable RSA implementation
  1 project | /r/cryptography | 19 Sep 2021

  Also what you need doesn't require that much code, it's very similar to: https://github.com/p4-team/ctf/tree/master/2017-09-02-tokyo/crypto_rsa

• Cryptopals 2:12 - What real-world application of crypto does the solution actually break?
  1 project | /r/crypto | 16 Jul 2021
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