Index - 2013 Xmas Cipher Challenge Part 2 Solution2018-04-30
Plenty of clues for this one. Big hint it's simple morse code. The file:
It's a safe presumption the red and green notes represent dots and dashes.
rrgr grg rg g ggrg rg gr rrg rg rrg ggr grg ggrg grg grrg g grg rrg grrg rggg rrgr grg gggr ggrg grg ggggr rgr gg rg rrgr rggg rrg gggg grrg rgr g ggggr ggg g rggg rrgg rrgg g rrgg rggg g ggrg grg
If we interpret the red as dash this morse decodes to:
We were warned that the message was both encoded and encrypted. I merrily went off down a rabbit hole at this point trying all sorts of different approaches (including looking in the PNG file metadata and raw hex for a key), but it turned out to be but the simplest ROT13:
And the solution is revealed.
2013 Xmas Cipher Challenge Part 1 Solution2013 Xmas Cipher Challenge Part 3 Solution