JLCPCB color silkscreen files are encrypted using AES-128-GCM and RSA-2048 with OAEP padding with SHA-256 as the hash function. Unfortunately, this means that, although it is possible for tools other than EasyEDA to create files, only JLCPCB can decrypt the resulting files.
The structure of an encrypted file is as follows:
| require 'rmagick' | |
| require 'chunky_png' | |
| # Simple least significant bit steganography. Hides a message in the | |
| # least significant bit of the red channel of the image. | |
| # | |
| # Requires ImageMagick, Ruby 2.5, rmagick gem, chunky_png gem | |
| # | |
| # To encode a message: | |
| # ruby lsb.rb encode image_file message encdoded_filename |
| # IMPORTANT! | |
| # This gist has been transformed into a github repo | |
| # You can find the most recent version there: | |
| # https://github.com/Neo23x0/auditd | |
| # ___ ___ __ __ | |
| # / | __ ______/ (_) /_____/ / | |
| # / /| |/ / / / __ / / __/ __ / | |
| # / ___ / /_/ / /_/ / / /_/ /_/ / | |
| # /_/ |_\__,_/\__,_/_/\__/\__,_/ |
Below is the starting tweet for each thread of #CipherMysteries. 32 total ciphers will be discussed. When all 32 are tweeted, a post at my blog (https://pthree.org) will be written discussing each of the 32 at length.
| <?php | |
| ///////////////////// | |
| // slack2html | |
| // by @levelsio | |
| ///////////////////// | |
| // | |
| ///////////////////// | |
| // WHAT DOES THIS DO? | |
| ///////////////////// | |
| // |
| <? | |
| ///////////////////// | |
| // slack2html | |
| // by @levelsio | |
| ///////////////////// | |
| // | |
| ///////////////////// | |
| // WHAT DOES THIS DO? | |
| ///////////////////// | |
| // |
| <? | |
| ///////////////////// | |
| // slack2html | |
| // by @levelsio | |
| ///////////////////// | |
| // | |
| ///////////////////// | |
| // WHAT DOES THIS DO? | |
| ///////////////////// | |
| // |