Solution #

You will be given the following files.

  • ende.py
  • flag.txt.en
  • pw.txt

The ende.py is a simple encryption/decryption script.

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$ python scripts/ende.py
Usage: scripts/ende.py (-e/-d) [file]

The flag.txt.en is an encrypted flag. I used the string in pw.txt as a password.

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$ python scripts/ende.py -d scripts/flag.txt.en
Please enter the password:ac9bd0ffac9bd0ffac9bd0ffac9bd0ff
picoCTF{4p0110_1n_7h3_h0us3_ac9bd0ff}

Acknowledgement #

Thank you, CMU security and privacy experts, for creating this challenge.