Categories

  • Cryptography,  Cryptography,  CTF,  ShellCTF

    shellCTF – Encoder (Cryptography)

    Another challenge in the shellCTF Cryptography category was called encoder and this is how it was solved. Using Cybershef I chose the Encryption / Encoding category and moved the ROT13 block to the Recipe. ROT13 which is a simple Caeser cipher. Using this cipher I chose the rotate amount to 19 to get the flag. (-7 will also work as 26 – 7 is 19). Below is a short video to show the process:

  • Cryptography,  Cryptography,  CTF,  ShellCTF

    shellCTF – Algoric Shift (Cryptography)

    Tiens (Verniel) competed in the shellCTF this past weekend and here’s the first solution to the flag for the first Cryptography challenge. The challenge was called “Algoric-Shift” and we were given the below: Download the script.py to decrypt the above ciphered text. To view the code please watch the video below for this challenge as I do not want to share it since it is not my code. In short there is a text variable containing a string ‘flag{…}’, the program contains 3 lists and checks the length of the text variable. It then does a modulus on each and appends each character to a list. I pasted the ciphered…