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This one was fun! To represent 12 values as a pixel I used 2x2 pixel blocks of RGB (exactly 12 values). After rendering first letter I decided to fetch random pixels instead of lines, and it was clear that letters are between 100 and 300(param two), so I got readable answer pretty fast!

Couldn't figure out the solution for a long time. But after a while I looked at the challenge with the fresh eyes! Based on the fact that every number starts with 00 01 or 02, I made a decision that numbers are independent (at least you probably shouldn't concatenate encoded ones), and started to se...

It is actually much easier than you might think of it. As a hint you can take a look at challenge category, it says crypto, so you shouldn't mess with instructions, it is more about text encoding. But DEC computers are the clue, thats true!