Mark Clowes

Index - 2013 Xmas Cipher Challenge Part 2 Solution



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