2013 Xmas Cipher Challenge Part 2 Solution

2018/04/30 --Message From Morse

cipher-2.PNG
[cipher-2.PNG]

Plenty of clues for this one. Big hint it's simple morse code. The file:

challenge2.png
[challenge2.png]

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:

QRNEFNAGNGURFRPERGPBQRVFR4KINQBGHPKE4SEBZZEZBEFR

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:

DEARSANTATHESECRETCODEISE4XVADOTUCXR4FROMMRMORSE

And the solution is revealed.


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2013 Xmas Cipher Challenge Part 1 Solution2013 Xmas Cipher Challenge Part 3 Solution