Morse Code for CTFs (PicoCTF 2022 #16 'morse-code')
13,532
Published 2022-04-26
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All Comments (14)
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"What hath God wrought", the official first Morse code message transmitted in the US on May 24, 1844, to officially open the Baltimore–Washington telegraph line -- Wikipedia
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No time wasted! I like your approach to trying several different avenues or "nerd out" as you say, lol because it helps us noobs get a realistic view of CTFs. That we're not always going to just sit down get it the first try. Thanks so much John!!
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This is an interesting example of the value of a diverse knowledge base. Technical knowledge is essential, but knowledge of history and linguistics are extremely helpful for identifying the flag. It seemed like John, a HIGHLY educated security pro, was thrown by the use of an archaic past participle in that historical quote.
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Can you put this in a playlist please John. Thanks for the videos as always
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I'd like too point out that mplayer did recognize this as a 1 channel pulse, 2 bytes per sample. I didn't get into it but there's probably a way to do this with a hex editor or something similar, just analyzing the bytes figuring out the dots, dashes and pauses. Just a thought :)
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i did this one a bit more "manual" and opened the file in an audio editor and looking at the "spikes" small spike == . long spike == _ long silence was a space, and then put the result into a normal text morse decoder, didn't think of finding a audio morse decoder. kinda glad i didnt, felt like more of a proper challenge this way :P
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My audio analysis matched Audacity matched some web service I ran this through but it just wouldn't take my flag... should've kept guessing x)
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haha I actually went ahead and translated the sound by looking at the graphs in Audacity to dots and lines using my eyes. Threw that into cyberchef "from morse code" and I got the right flag.
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I just used morse2ascii tool in the Kali terminal and ran the file through that and it worked great
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king thank youu
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Audacity and cyber chef for this one
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Made a python script for decrypt those...on my github....nytorj
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those characters doesn't make any sense... i don't know what creator was thinking while creating that challenge...
