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The "Decrypt That" Contest :: Feb 28, 2011 @ 12:07am

 medeman

Joined: Mar 25, 2010
Posts: 1953
Location: Stay Hungry.Stay Foolish

Alright, here is the first StuffIt .sitx file to decrypt!

I will put more files of different types as the others get decrypted or canceled.

http://tinyurl.com/6kpuq9x (UPDATED March 2, 2011!)

Please post the contained file (a .png image) here and if you are the first, you will win!

Prize: Good question...Uhmm...Ubuntu 10.10 OR Debian 6.0.0, you can choose, I'll give you the download links!
post updated on Mar 2, 2011 @ 9:02am
Re: The "Decrypt That" Contest :: Feb 28, 2011 @ 12:15am

 medeman

Joined: Mar 25, 2010
Posts: 1953
Location: Stay Hungry.Stay Foolish

Hints

Password has 20 digits

Only contains numbers and letters (small only, no special characters, no spaces), no symbols

Now what you have to do is:

1. Find the solution (x = solution) of this:
2x = 2 * 4 - 6 * 3 - 1x

2. Let's say the result is 345, then the password would look like this:
3a4b5c3d4e5f3g4h5i3j


New hint: Don't calculate * before -/+; calculate number by number!

So, if you don't find a solution, I'll add more hints overtime.
post updated on Mar 2, 2011 @ 1:30pm
Re: The "Decrypt That" Contest :: Feb 28, 2011 @ 1:05am

 marky1991

Joined: Nov 8, 2009
Posts: 7155
Location: Douglasville, GA

Deputy
Note: "Price" != "Prize".
Re: The "Decrypt That" Contest :: Feb 28, 2011 @ 2:38am

 marky1991

Joined: Nov 8, 2009
Posts: 7155
Location: Douglasville, GA

Deputy
I'd never even heard of a stuffit file was until I looked it up...

What does "decrypting" mean? Are we expected to guess the password somehow? I like puzzles, but I don't think we have much to go on right now... (I even tried "no hints available...." as the password, lol.)

Are we supposed to go around the password protection somehow? (I don't think that's possible. Lots of posts from ~2000 say that contemporary versions of stuffit were essentially unbreakable.)
Re: The "Decrypt That" Contest :: Feb 28, 2011 @ 6:00am

 medeman

Joined: Mar 25, 2010
Posts: 1953
Location: Stay Hungry.Stay Foolish

Well, I'll give more hints soon, for now, you have to...

...guess
OR
...bruteforce (password is 20+ digits, so this shouldn't be possible that easy)
...write an application to crack it
...I dunno...
Re: The "Decrypt That" Contest :: Feb 28, 2011 @ 6:02am

 medeman

Joined: Mar 25, 2010
Posts: 1953
Location: Stay Hungry.Stay Foolish

Note: "Price" != "Prize".

Thanks, fixed it!
Re: The "Decrypt That" Contest :: Feb 28, 2011 @ 7:08am

 assassin437

Joined: Jan 29, 2007
Posts: 1118
Location: Quantification

Sheriff
I'll complete this challenge Medeman if you complete mine. It's to fly, using homemade apparatus, from Columbia to Timbuktu. The ways to do this are:

+ Close your eyes, leap and hope
+ Jump and flap your arms (but it's several hundred/thousand miles so shouldn't be that easy)
+ Build your own aeroplane
+ I dunno...

Good luck! :)
post updated on Feb 28, 2011 @ 7:09am
Re: The "Decrypt That" Contest :: Feb 28, 2011 @ 10:34am

 medeman

Joined: Mar 25, 2010
Posts: 1953
Location: Stay Hungry.Stay Foolish

I'll complete this challenge Medeman if you complete mine. It's to fly, using homemade apparatus, from Columbia to Timbuktu. The ways to do this are:

+ Close your eyes, leap and hope
+ Jump and flap your arms (but it's several hundred/thousand miles so shouldn't be that easy)
+ Build your own aeroplane
+ I dunno...

Good luck! :)

Done, already back in Germany. Now complete mine.
Re: The "Decrypt That" Contest :: Feb 28, 2011 @ 10:44am

 assassin437

Joined: Jan 29, 2007
Posts: 1118
Location: Quantification

Sheriff
Completed yours :)

Also, fun fact!

It would take about 316,000 years to brute force crack a 20 digit random collection of numbers, with one consumer PC powering the attack.
post updated on Feb 28, 2011 @ 10:49am
Re: The "Decrypt That" Contest :: Feb 28, 2011 @ 12:37pm

 medeman

Joined: Mar 25, 2010
Posts: 1953
Location: Stay Hungry.Stay Foolish

Completed yours :)

Also, fun fact!

It would take about 316,000 years to brute force crack a 20 digit random collection of numbers, with one consumer PC powering the attack.

You didn't, you have to post the pic first!
Re: The "Decrypt That" Contest :: Mar 1, 2011 @ 3:08am

 assassin437

Joined: Jan 29, 2007
Posts: 1118
Location: Quantification

Sheriff
Sure! I'll post the picture when you post a video of your flight :D
Re: The "Decrypt That" Contest :: Mar 1, 2011 @ 9:10am

 medeman

Joined: Mar 25, 2010
Posts: 1953
Location: Stay Hungry.Stay Foolish

Sure! I'll post the picture when you post a video of your flight :D

You didn't requested one, so I didn't made one. I requested the upload of the content of the file (picture). And no I won't fly there again...
Re: The "Decrypt That" Contest :: Mar 1, 2011 @ 2:41pm

 marky1991

Joined: Nov 8, 2009
Posts: 7155
Location: Douglasville, GA

Deputy
Thanks for warning me of the impossibility of the brute force approach, assassin. I was actually going to try it.

Hmm. I wonder if "jasWW" reveals anything about the rest of the password. Maybe it's it's a sequence of some sort? (Edit: Not found in the integer sequence database www.oeis.org

I'm not sure if this contest is a hopeless brute force only contest or if a clever solution can be found. Medeman, could you clarify which it is? I don't want to waste time thinking about a problem if there's no real way to solve it.


edit: Wondered about the revealed part of the password.

edit 2: Asked medeman if a brute force algorithm is the only way to solve it.
post updated on Mar 1, 2011 @ 3:00pm
Re: The "Decrypt That" Contest :: Mar 1, 2011 @ 3:51pm

 kunckles

Joined: Feb 12, 2010
Posts: 650
Location: here

Sure! I'll post the picture when you post a video of your flight :D

You didn't requested one, so I didn't made one. I requested the upload of the content of the file (picture). And no I won't fly there again...

I think he got you assassin. :-)

Thanks for warning me of the impossibility of the brute force approach, assassin. I was actually going to try it.

Really?  lol

Medeman, does the password only use letters from the English alphabet?  Also, does it use spaces?


-Kunckles
post updated on Mar 1, 2011 @ 3:52pm
Re: The "Decrypt That" Contest :: Mar 1, 2011 @ 4:23pm

 marky1991

Joined: Nov 8, 2009
Posts: 7155
Location: Douglasville, GA

Deputy
@knuckles: I've never tried to crack a password before! I didn't think the brute force approach would take that long. 

-the dumb CS major
Re: The "Decrypt That" Contest :: Mar 2, 2011 @ 12:25am

 medeman

Joined: Mar 25, 2010
Posts: 1953
Location: Stay Hungry.Stay Foolish

I guess I'm gonna update the file to make it easier ;-).
Re: The "Decrypt That" Contest :: Mar 2, 2011 @ 7:30am

 assassin437

Joined: Jan 29, 2007
Posts: 1118
Location: Quantification

Sheriff
Thanks for warning me...no real way to solve it.


No problemo!

This seems like an unlikely contest. The point I was facetiously making above is that he's set an arbitrary challenge which is basically impossible. 

Do you really think that the password feature on a professional product can be cracked by some teens on the Galcon Forums?

It'll just be guessing attempts till you stumble on the right one.

Correct me if I'm wrong medeman?
Re: The "Decrypt That" Contest :: Mar 2, 2011 @ 9:00am

 medeman

Joined: Mar 25, 2010
Posts: 1953
Location: Stay Hungry.Stay Foolish

Current contest is canceled!
Re: The "Decrypt That" Contest :: Mar 2, 2011 @ 9:10am

 medeman

Joined: Mar 25, 2010
Posts: 1953
Location: Stay Hungry.Stay Foolish

File has updated, download the file from the URL again (is named different) and follow the hints in the second post!
Re: The "Decrypt That" Contest :: Mar 2, 2011 @ 12:36pm

 swollenpig

Joined: Jun 12, 2010
Posts: 951
Location: Colorado

Wait, unless I'm wrong, x=-(10/3) or x=-3.333. I can't see how this could fit into the equation thing that you provided. I guess 4a.3b3c3d and so on. (I'm on a iPad, so I can't answer this myself.)

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