June's Crypto Challenge has now came to a close and I'm glad to report that several participants were able to complete the challenge successfully. I've posted the solution below for everyone to see, so click here if you want to try and solve the challenge without looking at the answer first.
Winners
1st – @apolkosnik
2nd – @alecrwaters
3rd – @shftleft
4th – @RavenBlackthorn
5th – @schuetzdj
6th – @SecShoggoth
7th – @DuncanGilmore
8th – @thornmaker
Solution
Step 1: Decode Base64
NjggNzQgNzQgNzAgNzMgNjMgNnMgNnAgNnMgNnIgNzMgNnAgNjEgNzMgNjggNzMgNnAgNjEgNzMg
NjggNjQgNnAgNjQgNnMgNzQgNjcgNjUgNzQgNjQgNzIgNnMgNzAgNjIgNnMgNzggNjQgNnMgNzQg
NjMgNnMgNnEgNzMgNnAgNjEgNzMgNjggNzUgNzMgNnAgNjEgNzMgNjggMzIgMzIgMzAgMzggMzAg
NzMgNnAgNjEgNzMgNjggNjggNjkgNnIgNzQgNjQgNnMgNzQgNjggNzQgNnEgNnA=
Step 2: Decode ROT13
68 74 74 70 73 63 6s 6p 6s 6r 73 6p 61 73 68 73 6p 61 73 68 64 6p 64 6s 74 67 65 74 64 72 6s 70 62 6s 78 64 6s 74 63 6s 6q 73 6p 61 73 68 75 73 6p 61 73 68 32 32 30 38 30 73 6p 61 73 68 68 69 6r 74 64 6s 74 68 74 6q 6p
Step 3: Decode Hex
68 74 74 70 73 63 6f 6c 6f 6e 73 6c 61 73 68 73 6c 61 73 68 64 6c 64 6f 74 67 65 74 64 72 6f 70 62 6f 78 64 6f 74 63 6f 6d 73 6c 61 73 68 75 73 6c 61 73 68 32 32 30 38 30 73 6c 61 73 68 68 69 6e 74 64 6f 74 68 74 6d 6c
Step 4: Form URL
httpscolonslashslashdldotgetdropboxdotcomslashuslash22080slashhintdothtml
Step 5: View URL
http://dl.getdropbox.com/u/22080/hint.html
Step 6: Decode ASCII art using link at bottom of hint.html
Step 7: ASCII decodes to an image of a link (). Access the link to retrieve the ancient alphabet.
Step 8: Revisit hint.html and decode the AES encrypted string. Key and other hints are hidden in CSS.
Decoded: httpscolonslashslashdldotgetdropboxdotcomslashuslash22080slashfiledotzip
Step 8: Fix URL
https://dl.getdropbox.com/slash/u/22080/file.zip
Step 9: Download and Unzip the file
Step 10: Use Spectrogram 16 (hint from CSS) to analyze the WAV file
Step 10: Decode the image from the spectral analysis with the legend found in Step 7
Step 11: Decode ROT13
graroebhf
Final Solution: Tenebous (It was the word of the day) 🙂
I'm going to start working on creating the next challenge soon, so feel free to send me your suggestions and I will factor them in next round.