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decryption contest – firemaker103

firemaker103

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Posts: 643
From:
Registered: 07-13-2005
 		I'll be another pioneer and try for a new kind contest.
As you would have guessed, you just have to be the first one to decrypt the text. (And so I can test my new encrytion method... )

Reason also is if you're bored, want a challenge, or ummm....

Prize to be decided.

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߰ߗ~ĢPݿݣ 0ݔȪ`߷ݮdߕ8߭\¤~̢ߨB:<߽p
ݾ0ᨪ9u߯2p]*.dk@Ey^݋_(ew_ݞݟxݎ(ߺ~y0@?v)B:%I*883|dx0߃|^ݙݚpp݃\ݦ~ tZ:8:\D0fݥ~Ģ )0vݱj}2¢C ߙx 08b dA@ݖ¼3d´
NUݹ'݈ݣd ݬl*ݰ 4݄ ݽ,"ݲ!+ݕ2d,ݏiDJy8vP;#g4߂^s^~jj`b~nvxUWR8

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Valkyri

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Posts: 205
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Registered: 08-13-2005
 		...

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Lava
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Posts: 1905
From:
Registered: 01-26-2005
 		Ok... what language is it decrpyted in?

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[This message has been edited by lava (edited August 28, 2005).]
firemaker103

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Posts: 643
From:
Registered: 07-13-2005
 		erm, decrypted it is english and is 44 KB...

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"Be nice to the nerds because later on, you'll be working for them" - Bill Gates
Jari

Member

Posts: 1471
From: Helsinki, Finland
Registered: 03-11-2005
 		Beats me. I can merely encrypt text but not decrypt without knowing the format.

Could you decrypt it your self firemaker if you wouldn't know the algorithm?

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CoolJ

Member

Posts: 354
From: ny
Registered: 07-11-2004
 		ok, there's no way i can decrypt this, can i guess?

book of romans -kjv
kiwee

Member

Posts: 578
From: oxfordshire, england
Registered: 04-17-2004
 		its all greek to me!

i am an artist, not a decrypter

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Klumsy

Administrator

Posts: 1061
From: Port Angeles, WA, USA
Registered: 10-25-2001
 		is this like a codebreaking entry exam from the NSA or CIA or something?

i don't have much time to really mess with this, but i'll make some assumptions and suggestions, and if the author can give some clues may give it ago..

i assume its just plain text, "encrypted" with a simple method (not like a real enryption algorithm.. from looking at it, it seems like all high value ascii values, so possibly just a formula like Character = Character + X? maybe a little more complicated with some Xors or something in it. if it is a simple one, if we looked at the range of ascii values.. and also the most common characters to show (and see if they map to most common characters in english), as well as looking for any repeated patterns, we'd be well on our way to 'cracking' this code.

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firemaker103

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Posts: 643
From:
Registered: 07-13-2005
 		exactly. I want to see if anyone can break through this.

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firemaker103

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Posts: 643
From:
Registered: 07-13-2005
 		erm, i don't know about guessing but sure.....

Some hints:
A short one of 80 bytes:


²Ģ¸谪4`ʶƨj&V

And since you probably want this the decrytion of the short one above:

The lazy fox jumped over the stupid little cat. Do you know what I'm getting at?


[This message has been edited by firemaker103 (edited August 29, 2005).]
HanClinto

Administrator

Posts: 1828
From: Indiana
Registered: 10-11-2004
 		Hrm, I wrote a short program that converts back and forth between the example code, but it doesn't really work for the larger one.

Iiiinteresting.

--clint

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firemaker103

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Posts: 643
From:
Registered: 07-13-2005
 		Oops.

Try it now.

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"Be nice to the nerds because later on, you'll be working for them" - Bill Gates
HanClinto

Administrator

Posts: 1828
From: Indiana
Registered: 10-11-2004
 		Ah, forgot the key byte, eh?

--clint

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Seven7
Member

Posts: 50
From: USA
Registered: 03-16-2005
First, I don't have the time to go writing a reveres encryption
algorithm, but by working backwards I can tell you what its not encrypted
with. By looking at the string, I see youre encrypting using Extended
ASCII. The algorithm youre using to do encryption is not "balancing" the
encryption. What I mean is that the way the characters are being
shifted to produce an encrypted character are favoring Extended ASCII
characters. In an encryption algorithm you want a bell shaped curve
(remember your statistics?) this will produce a well distributed set of
encrypted ASCII characters. The algorithm your using does not do this.
The bell shape curve looks skewed. (lop-sided), which of course means
that your distribution of encrypted characters favor a set of ASCII in
this case extended ASCII. This means that the encrypted string you've
provided CAN be decrypted, but it will take more time and work.

From what I see from a statistical point, there is no compression, there
a shifting method (substitution method) but your not including "readable"
ASCII characters (this is not a good technique because your limiting the
set of ASCII characters in your algorithm). A good partion of the text file
being enrypted to is using Extended ASCII. Which means "Skewness" in the
bell shape curve. (A bad thing).

Looks strong enough to discourage people from sitting down and picking it
apart. I wouldn't trust the code to keep my bank records though.

Nice work though!

j.

[This message has been edited by Seven7 (edited August 29, 2005).]
firemaker103

Member

Posts: 643
From:
Registered: 07-13-2005
 		i never said it CAN'T be decrypted.

Nothing is.

First compression, then encytion with a random key, then again encrypted.

Yes, it wil be updated.

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"Be nice to the nerds because later on, you'll be working for them" - Bill Gates
firemaker103

Member

Posts: 643
From:
Registered: 07-13-2005
 		now this is so hard:

(Not the same thing. Totally different)


JJJJXJJf$)$1bJ(J
JPJJ/J+m1a$KG~<|z

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firemaker103

Member

Posts: 643
From:
Registered: 07-13-2005
 		would you be able to sove any of these if you just looked at my file?

Maybe if you took a whole 2 days and where very experianced.

(lol, how about a different encrytion every 30 seconds?)

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"Be nice to the nerds because later on, you'll be working for them" - Bill Gates
Seven7
Member

Posts: 50
From: USA
Registered: 03-16-2005
quote:
First compression...

Which compression algorithum are you using?
firemaker103

Member

Posts: 643
From:
Registered: 07-13-2005
quote:
Originally posted by Seven7:

Which compression algorithum are you using?


one in blitzbasic.

I can show it to you all if you want to make it easier...

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goop2

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Posts: 1059
From:
Registered: 06-30-2004
 		hmmm... why do 3 of the numbers in your avatar not change?

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Seven7
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Posts: 50
From: USA
Registered: 03-16-2005
 		[/QUOTE]..one in blitzbasic. [/QUOTE]

I asked what algorithm your using to do compression and encryption,
not what "add-on" or STL or SDL your using; DES, Blowfish, IDEA??
firemaker103

Member

Posts: 643
From:
Registered: 07-13-2005
 		I'll up the anty.... first, forget about that first one, not secure as I would have liked. Person who gets this one(not compressed), get's my version of Blitz2D( I don't need it anymore, what with Blitz3D ) Yes, I trust it THAT much.

DwErJ@H@J2ErD#H@1f112ErSdA1wEr1fDrDK123#hJK6#Dd22SK6@3KG3D1v1fd#J2hvJK3@JK#2DDK#Ddh2D2K#DD1wJK2eDdd@Sdhe1#De12^1d!#JfNSdGr3f13K2w1212JdED#1v3DK@1#H#DdDrSDJ#D^=

Oh, yeah. The first one was the include of WinBlitz3D( a userlib)

Good Luck!


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"Be nice to the nerds because later on, you'll be working for them" - Bill Gates

[This message has been edited by firemaker103 (edited February 03, 2006).]
buddboy

Member

Posts: 2220
From: New Albany, Indiana, U.S.
Registered: 10-08-2004
 		wow... lol... there's NO way i could do that... lol... have NO idea where to start... lol...

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CPUFreak91

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Posts: 2337
From:
Registered: 02-01-2005
 		Dude, I can try to decrypt it, but I need a file. I can save any of that encoding!

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All Your Base Are Belong To Us!!! chown -r us ./base

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vincent

Member

Posts: 129
From: Amersfoort, the Netherlands
Registered: 12-23-2002
 		Looks a bit like a simple character replacements encryptions, like A=B and C=g or something.
Unfortunatly I don't have time right now to decrypt this, but it looks quite breakable.
My guess would be that the # might be the space.

[This message has been edited by vincent (edited February 06, 2006).]
CPUFreak91

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Posts: 2337
From:
Registered: 02-01-2005
 		Well it looks like I can't use John. (Is that cheating?)
Anyways. If I ever decrypt this cheating or not, you don't need to send me you copy of Blitz.

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All Your Base Are Belong To Us!!! chown -r us ./base

``After three days without programming, life becomes meaningless.'' -- Tao of Programming Book 2
buddboy

Member

Posts: 2220
From: New Albany, Indiana, U.S.
Registered: 10-08-2004
 		wow... PLEASE LET ME GET IT... I WOULD LOVE TO HAVE A BLITZ THINGY TO SEE IF IT'S BETTER THAN THE DEMO... LOL...

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In the stock market, you must buy high and sell low...Wait! That's not right!
--------------
Yes, I can be intelligent at times!!
CPUFreak91

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Posts: 2337
From:
Registered: 02-01-2005
quote:
Originally posted by buddboy:
wow... PLEASE LET ME GET IT... I WOULD LOVE TO HAVE A BLITZ THINGY TO SEE IF IT'S BETTER THAN THE DEMO... LOL...

Ok, if I decrypt the bloomin' thing give the Blitz to buddboy.

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All Your Base Are Belong To Us!!! chown -r us ./base

``After three days without programming, life becomes meaningless.'' -- Tao of Programming Book 2
firemaker103

Member

Posts: 643
From:
Registered: 07-13-2005
quote:
Originally posted by vincent:
Looks a bit like a simple character replacements encryptions, like A=B and C=g or something.


Looks can be deceiving....

@CPUfreak
Yeah, sure, as long as someone breaks it.

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buddboy

Member

Posts: 2220
From: New Albany, Indiana, U.S.
Registered: 10-08-2004
 		lol... thnx CPU!!

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In the stock market, you must buy high and sell low...Wait! That's not right!
--------------
Yes, I can be intelligent at times!!
vincent

Member

Posts: 129
From: Amersfoort, the Netherlands
Registered: 12-23-2002
 		Is the encryption just an algorithm or does it also have some kind of key?
firemaker103

Member

Posts: 643
From:
Registered: 07-13-2005
 		Key. KEY.

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"Be nice to the nerds because later on, you'll be working for them" - Bill Gates

[This message has been edited by firemaker103 (edited February 11, 2006).]
vincent

Member

Posts: 129
From: Amersfoort, the Netherlands
Registered: 12-23-2002
 		Key. KEY... is the key 'KEY'? or err... *doesn't get what sounded stupid* So, can you give us a hint or something... Like 'the first letter is the same as in the original'....?
CapnStank

Member

Posts: 214
From: Sask, Canada
Registered: 12-16-2004
 		Damnit! I can't find the wargame I played once. 8 levels full of decrypting **** . I got to the last one which required a brute forcer. I made one but didn't have a compiler on the computer so I quit, lost the url.

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vincent

Member

Posts: 129
From: Amersfoort, the Netherlands
Registered: 12-23-2002
 		'key, KEY.' == 'key: KEY'?
firemaker103

Member

Posts: 643
From:
Registered: 07-13-2005
 		heh.
NO!

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"Be nice to the nerds because later on, you'll be working for them" - Bill Gates
vincent

Member

Posts: 129
From: Amersfoort, the Netherlands
Registered: 12-23-2002
 		if (key != 'KEY') {
giveCluePlease();
} else {
doTheFunkyChicken3TimesAroundTheTable();
}
CPUFreak91

Member

Posts: 2337
From:
Registered: 02-01-2005
quote:
Originally posted by vincent:
if (key != 'KEY') {
giveCluePlease();
} else {
doTheFunkyChicken3TimesAroundTheTable();
}


Is that even close? If not, that's a funny try. If so, that's still funny.

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All Your Base Are Belong To Us!!! chown -r us ./base

``After three days without programming, life becomes meaningless.'' -- Tao of Programming Book 2
firemaker103

Member

Posts: 643
From:
Registered: 07-13-2005
 		9 words, 48 letters, 6 puncuation marks

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"Be nice to the nerds because later on, you'll be working for them" - Bill Gates