ALPHASE

Aku ingin menjadi cukup kuat. Kemarin aku telah menjadi kuat, tetapi itu tidak cukup.

picoCTF - rotation


  • URL: https://play.picoctf.org/practice/challenge/373
  • Title: rotation
  • Tags: Medium, Cryptography, picoCTF 2023
  • Author: Loic Shema
  • Started: 21 July 2025
  • Solved: 21 July 2025
  • Description: You will find the flag after decrypting this file Download the encrypted flag here.

File downloaded contains this text

xqkwKBN{z0bib1wv_l3kzgxb3l_7l140864}

The hint and title suggested that I could use ROTX to get the flag. Even so, I didn’t know what is the number for the right rotation. Well, we can always try, right?

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picoCTF - 13


  • URL: https://play.picoctf.org/practice/challenge/62
  • Title: 13
  • Tags: Easy, Cryptography, picoCTF 2019
  • Author: Alex Fulton/Daniel Tunitis
  • Started: 20 July 2025
  • Solved: 20 July 2025
  • Description: Cryptography can be easy, do you know what ROT13 is? cvpbPGS{abg_gbb_onq_bs_n_ceboyrz}

The encrypted flag is in the description. In fact, this is a similar problem to Mod 26. I just use my swiss-army knife for CTF which is CyberChef again.

alt text

picoCTF{not_too_bad_of_a_problem}

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