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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:
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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…
