Pikachuface CTF

Task

Find the solution of the puzzle. All parts of the solution word can be found in the file 00_specification/pikachuface.svg.zst. A decompressed version of that file can be found at 00_specification/pikachuface.svg.

Hint: The solution starts with CSR{ and ends with }.

Good luck.

Solution

Run ./solution.sh to step through a possible solution path.

Dependencies

• Linux environment
• 00_specification/pikachuface.svg must be decompressed before
• github.com/paxtonhare/demo-magic is part of the repository
• pv (pipe viewer) must be installed
• zstd can be used to decompress the specification file

Further notes

As the remote repository does not allow files bigger than 100 MB in size, two files had to be removed from the repo:

00_specification/pikachuface.svg:

• This file can be decompressed from *.svg.zst. You can use the zstd library to accomplish this.

cache/01_all_query_entries.txt:

• This file lists all possible entries of media queries from the specification file and is copied instead of being generated to skip this lengthy process. It has 4_362_443 lines of text. In the next step of the solution, we remove all duplicate entries. It makes the file small enough to fit into the repository. Therefore, it is not as problematic if we skip over this part. We copied the result from the next step into this file to ensure the solution script executes smoothly. Another solution would be to generate this file with the following command by yourself (takes approximately 12 minutes): ./bin/02_generate_pixels_per_image.sh.