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Topic: crypto challenge (Read 548 times) |
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towr
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crypto challenge
« on: May 25th, 2015, 1:49am » |
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On https://gist.github.com/tqbf/3132713 you'll find 327 lines of hex-encoded characters, one of the lines is a line of English text encoded by XOR-ing it with a single character, the rest of the characters are random.
What is the line of text?
Did you find the right line before trying to decode it?
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markr
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Re: crypto challenge
« Reply #1 on: May 26th, 2015, 12:08am » |
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"now that the party is jumping"
It was the first line I decoded.
I can't get hide to work....
//added hide tags --towr
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| « Last Edit: May 26th, 2015, 8:38am by towr » |
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towr
wu::riddles Moderator
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Re: crypto challenge
« Reply #2 on: May 26th, 2015, 8:40am » |
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To hide something you can put hide tags around it.
Like
[hide]<hidden text here>[/hide]
Some javascript on the forum is broken, so the buttons for adding tags or smileys may not work, but adding them manually still works.
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| « Last Edit: May 26th, 2015, 8:51am by towr » |
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rloginunix
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Re: crypto challenge
« Reply #3 on: May 26th, 2015, 8:46am » |
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Well done but your capitalization is a bit off.
For completeness:
The phrase is Now that the party is jumping
The key is 5, (53)10, (35)16
The line number is one hundred seventy one
on May 26th, 2015, 12:08am, markr wrote:| I can't get hide to work.... |
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At the top of this page there is a "Help" link. Click it. On the left-hand side of the help page there is another link called "Posting" - basic tags usage is here.
To hide a chunk of text surround it with the "hide" and "/hide" tags each of which must be inside the square brackets [ and ], tight, no spaces. To hide a chunk of text in a rectangle (block) use "hideb" and "/hideb" tags in the same way. You may also click the corresponding buttons in the "Add YABBC tags" section.
[e]
sorry, towr - didn't see you on the forum at the time of this post, my bad.
[/e]
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| « Last Edit: May 26th, 2015, 8:54am by rloginunix » |
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SMQ
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Re: crypto challenge
« Reply #4 on: May 26th, 2015, 9:15am » |
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For finding the right line, a simple trick is to check the high bit of each byte. For ASCII text they'll all be the same, while for random data they'll (very) likely be different.
--SMQ
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--SMQ
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towr
wu::riddles Moderator
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Re: crypto challenge
« Reply #5 on: May 26th, 2015, 9:38am » |
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I just looked for the line with the least number of distinct (encrypted) characters
And then I guessed the most common character was "e", but of course it was <space>
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