Programming 10

Put your programming skills to the test in these challenges.

Re: Programming 10

Post by Necz on Sun Feb 27, 2011 12:46 pm
([msg=54421]see Re: Programming 10[/msg])

Hi, i know the last reply is a half year back, but i need help with this programming mission. read all of ur hints and tips, but i get no significant bytes in thr rgb values of the image.

can someone hlp me how to go on with this challenge?
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Re: Programming 10

Post by DrakierD on Sun Feb 27, 2011 2:51 pm
([msg=54426]see Re: Programming 10[/msg])

Necz wrote:Hi, i know the last reply is a half year back, but i need help with this programming mission. read all of ur hints and tips, but i get no significant bytes in thr rgb values of the image.

can someone hlp me how to go on with this challenge?


After re-reading the entire thread, I think there is more than enough information to figure it out. The hard part is going to be ... figuring it out.

When I did it, I had approximately 100 different generated images on my computer and I was ripping them all apart in different ways and comparing them to each other to see what was different and what was the same. Once you figure out the pattern (the easy part) then the tough part begins. It requires somewhat a brute-force approach (at least that's the approach I took).

At each step look at the data you have, then compare it with the notes here. You should find commonalities. Once you've verified you're on the right path, it becomes a lot of trial and error.
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Re: Programming 10

Post by Necz on Mon Feb 28, 2011 12:53 pm
([msg=54454]see Re: Programming 10[/msg])

Thanks for your response.

Yeh the problem is, i thought i was on the right path,
cos there was a difference in some pixels compared to the others in the image,
but the number of diffrent pixels was variable in each image. so i got stuck.

i found out that there is an irregularity in the images, but in this post sth was said about 88 characters,
but the number of diffrent pixels i got is between 176 and 218.

i keep on thinking!
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Re: Programming 10

Post by syn111 on Sun Mar 06, 2011 10:55 am
([msg=54722]see Re: Programming 10[/msg])

EDIT:

Nevermind, was not taking all the data due to stupid mistake...
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Re: Programming 10

Post by Yuji1 on Thu Jan 19, 2012 6:15 am
([msg=63766]see Re: Programming 10[/msg])

I don't follow. Got a hash, no clue as to what next. SHA256? Won't that take a good long while? Data: [88], Decoded: [64], if you follow?
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Re: Programming 10

Post by Defience on Thu Jan 19, 2012 4:35 pm
([msg=63772]see Re: Programming 10[/msg])

Probably my favorite programming challenge.....I don't want to give too much away but in short it goes something like this:
Find, convert, decode, compare. :ugeek:
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Re: Programming 10

Post by Yuji1 on Fri Jan 20, 2012 2:34 am
([msg=63783]see Re: Programming 10[/msg])

More or less, I found, supposedly you might call that conversion, then decoded...End result, no clue as it says it is encrypted multiple times, no indication of any significance for bruting with.
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Re: Programming 10

Post by QtDevl on Tue Feb 21, 2012 3:44 am
([msg=64524]see Re: Programming 10[/msg])

Yuji1 wrote:More or less, I found, supposedly you might call that conversion, then decoded...End result, no clue as it says it is encrypted multiple times, no indication of any significance for bruting with.

if you have found really what is the first data,and was able to decode it...you should figure out what to bruteforce and how..also a hash identifier should be helpful if you don't know what that is,and reading mission info is vital to know HOW :P
If freedom is outlawed, only outlaws will have freedom...
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Re: Programming 10

Post by ZyrgEr on Tue Aug 20, 2013 12:05 pm
([msg=76913]see Re: Programming 10[/msg])

I ask what everyone else since there's no answer which helps me at all

How does examining rgb-values help at all? I can see that in every picture theres only one value out of (r,g,b) which changes. I have tried to find some kind of "interesting" values, similiar values, tried to count different colors in multiple ways and theres absolutely no data hidden in the picture.

I just can't see it. Any help?
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Re: Programming 10

Post by machinH on Wed Oct 16, 2013 1:16 pm
([msg=77706]see Re: Programming 10[/msg])

A bit late to answer the last question I guess, but I'd say : start by examining the general properties of the image. Then the "one off" thing should make sense.

I had a question about the character set used for the password in this mission, but I found the answer by myself just now. So now that im logged in, I wanted to say THANK YOU to the HTS team. I am learning so much thanks to this site. I don't think I could have learned that much, that fast, and with so much fun anywhere else.
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