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Day -1: Twelve steps of christmas
Description
On the third day of christmas my true love sent to me…
three caesar salads,
two to (the) six arguments,
one quick response.
Solution
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veGRXXXXXBiCQhPrNjZZ
The first line looks like a ceasar cipher, and it reads
1
Verse 3 done! Off with you! Get back to work! You're not done here...
The rest of the message looks like base64, but it isn’t quite right..
But what if we combine the two, do a caesar shift first, and then base64 decode?
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$ cat 0.txt | caesar 3 | base64 -d > caesarbase64
$ file caesarbase64
caesarbase64: PNG image data, 410 x 410, 8-bit grayscale, non-interlaced
we get a png image!
The image looks completely white..
but there are different shades of white, and using GIMP we can uncover the hidden QR code!
Flag
HV20{34t-sl33p-haxx-rep34t}