I enjoy playing CTF challenges, but often found that I was not available in
the short time period that the CTF was open (usually a weekend). I also
found that often times people would unintentionally (or intentionally)
break a challenge either during or after solving it. I also don't enjoy
enumeration during a CTF, I prefer a straight forward problem to which you
need to solve. As a solution to these frustrations, I created 247CTF which
is a CTF platform that does not have an end date, nor does it have
challenge sharing between different players (each challenge instance is
unique per user), nor is significant enumeration required.
I set a basescore of 10000 and we all wish you a
Time to learn French if you don't know it already: a new site has joined. It's called Énigmes À Thématiques and has challenges in many topics. Get your vin, baguette and other stereotypes and throw them away because you don't have time for that nonsense with this many new challenges.
that experts in the field of cryptography have joined the wechall network.
The new challenge site joining is MysteryTwister, which is part of the famous open-source project CrypTool, known amongst challengers.
CrypTool is an academic approach to teach the mathematics behind cryptography in an experimental manner by offering three offline e-learning programs (CT1, CT2, and JCT), the website CrypTool-Online, and the MysteryTwister crypto contest.
The puzzles on MTC3 are, of course, of cryptographic nature, and quite some of the problems are yet unsolved.
MTC3 has almost 9000 players from all around the world and the ciphertexts are presented in English and German. There is an active forum to discuss the problems in a non-spoiling, moderated manner.
Currently there are 260 challenges by more than 50 different authors, offering everything about crypto and computational number theory I can imagine -- from classical ciphers (Caesar, Vigenère, Hill, ...) to modern symmetric and asymmetric crypto (ORYX, AES, RSA, ECC, Lattice, homomorphic, DSA, ...).
So if you need a warmup or a fresh excourse in cryptography, this surely is a place to look at.
The site is scheduled with 10,000 basepoints, and the wechall score also includes old and inactive challenge sets.
The project lead Bernhard Esslinger is looking forward to your feedback and,maybe, a yet unsolved challenge to be cracked.
We all hope that many of you discover something new while trying out the
site and we wish you...
Another one for you challenge-site collection. Try to decrypt, as the name suggest, is focused on cryptography. Challenges provide you with a mechanism to encrypt chosen plaintexts, from which you have to recover the encryption method to decrypt the solution.
Another fairly new site has joined WeChall! With currently 26 machines available (and one more on the way) through a private network in addition to a bunch of other challenges, Hack The Box looks to be quite a challenge.
Many thanks to ch4p for making sure the site works optimally with ours!