diffie-hellman Description Alice and Bob wanted to exchange information secretly. The two of them agreed to use the Diffie-Hellman key exchange algorithm, using p = 13 and g = 5. They both chose numbers secretly where Alice chose 7 and Bob chose 3. Then, Alice sent Bob some encoded text (with both letters and digits) using the generated key as
credstuff Description We found a leak of a blackmarket website’s login credentials. Can you find the password of the user cultiris and successfully decrypt it? Download the leak here. The first user in usernames.txt corresponds to the first password in passwords.txt. The second user corresponds to the second password, and so on. Solving We got a tar file – extract
basic-mod2 Description A new modular challenge! Download the message here. Take each number mod 41 and find the modular inverse for the result. Then map to the following character set: 1-26 are the alphabet, 27-36 are the decimal digits, and 37 is an underscore. Wrap your decrypted message in the picoCTF flag format (i.e. picoCTF{decrypted_message}) Solving This challenge is similar
basic-mod1 Description We found this weird message being passed around on the servers, we think we have a working decrpytion scheme. Download the message here. Take each number mod 37 and map it to the following character set: 0-25 is the alphabet (uppercase), 26-35 are the decimal digits, and 36 is an underscore. Wrap your decrypted message in the picoCTF
AAAAA AAAAA. That’s all Download AAAAA Okay – first of all, like always I run file on this AAAAA file. This will tell us, that this is a data file. After that, I tried binwalk. BÄM There is an image included. My colleague uses CyberChef for this. There you can import the file and run Extract files on. I just
Deep Bielsa: ‚A man with new ideas is a madman, until his ideas triumph‘ Given is this foto: Todos Okay guys – this one is an easy one, but I did not solved that by my own! My personal rabbitholes Disclaimer: I couldn’t solve the challenge and had to bang my head on the edge of the table for hours
3in1 Description Like Nescafeeeee! Attachments https://ctf.k3rn3l4rmy.com/kernelctf-distribution-challs/nescafeee/AES.py Todos To decrypt the string in the given AES.py script (String is in scriptfile as a comment). from Crypto.Cipher import AES from Crypto.Hash import SHA256 f = open('progress.txt', 'r') password = ("abda") hash_obj = SHA256.new(password.encode('utf-8')) hkey = hash_obj.digest() def encrypt(info): msg = info BLOCK_SIZE = 16 PAD = "{" padding = lambda s: s
BSides-Jeddah-CTF Writeups to the BSides Jeddah CTF – 2021 Situation – BSides Jeddah BSides Jeddah is coming up with a blueteam flavored CTF this year hosted by CyberDefenders. This will be a Jeopardy-style intermediate CTF with a few harder challenges, including network analysis, memory forensics, and malicious document analysis. To get latest updates, follow us on twitter @JeddahBsides , @CyberDefenders.
BSides-Jeddah-CTF Writeup to the BSides Jeddah CTF – 2021 Situation – BSides Jeddah BSides Jeddah is coming up with a blueteam flavored CTF this year hosted by CyberDefenders. This will be a Jeopardy-style intermediate CTF with a few harder challenges, including network analysis, memory forensics and malicious document analysis. To get the latest updates, follow us on twitter @JeddahBsides ,
Spectres Points 450 Description We intercepted this image from a suspected insider threat at De Monne Financial. It looks like parts of the image were cut out, but based on conversations between DEADFACE and the insider, we believe DEADFACE’s wallet address is hidden in this image. Image Getting the flag Take the picture to https://aperisolve.fr/ -> Just read the flag