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HellBound Hackers | Computer General | Cryptography

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RE: can YOU do it?

spyware
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Posted on 25-04-07 11:09
If you want someone to test your encryption you should post a larger piece of text. Not just one line but more like 5/10 lines.

Just my two cents.
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Posted on 25-04-07 11:45
This is more like a mini challenge than testing an excryption though.

Makes it more fun and more difficult when there is less text to start with too.
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Posted on 25-04-07 11:56
thanks heaps, new one is up.

i think this one should be pretty uncrackable.. well, you know... with the available recourses i doubt anyone will crack it.

if no one has it in a week i'll release a hint. this one is VERY difficult.

and spyware, yes i agree that long strings are better, BUT this is testing for a purpose, and these are realistic sized chunks, although quite unrealistec sentences


bitchohealey at hotmail dot com skype:richohealey www.psych0tik.net
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Posted on 25-04-07 13:44
Ok... had a brief look at it. Without giving too much away, I'm guessing the first part is similar to the first part of number 2, but I need a key word?

I've tried a load of things which don't seem to help. If I'm right about the keyword, is it something guessable (or dictionary?) as otherwise I think you're right about it being almost uncrackable?

Or am I completely wrong? Smile
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Posted on 25-04-07 14:04
yup Smile right both times, i'm working on a version of the first bit, taken straight from the source of that module, to make it truly unique,

and yes, while the keyword is very logical, it's not at all guessable.

frankly i'd rate this as impossible, but if you get it i'll be super impressed


bitchohealey at hotmail dot com skype:richohealey www.psych0tik.net
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Posted on 25-04-07 14:21
I'll give it a go and see what I come up with. Guessing this one will get the better of me though
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Posted on 25-04-07 16:28
Quick update: wrote a basic bruteforcer to try and find the keyword. Used a 53MB dictionary (as it was and lowercased)..... don't think I found it.

Am I definately looking for a standard dictionary word?

I'm going offline now, but I might get some more time tomorrow
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Posted on 25-04-07 18:50
ive also make a quick lil encryption, you can find it at noobschallenges.org/textencrypt.php Smile enter between 1 and 10 characters and itll spit out a binary. bet noone can decrypt this string :
00000000000000000000000000000000
00000000000000000000000000000000000000000000
00000000000000000000000000000000000000000000000000
000000000000000000000000000000
000000000000000000000000000000000000000000
000000000000000000000000000000000000000000000000000
0000000000000000000000000000000000000000
000000000000000000000000000000000000001100000111110
00011111000111111110000000000000
00000000000000000000000000000000000000000000111
0000110001100110001100000000110000000000000000
00000000000000000000000000000000000000001
111000000000011000000011000000011
0110000110001111000110000110001111100110
11110000111100000011000000000110000000110000
0001100110000110011001100110000110011000110011100
1100110011000001100000001110000001110000000
1100011000011011000011011000011000000
011001100000011000011000011000000000110000000
110000011000011000011011000011011000011001111111001
1000000111111110000110000000000110000
00011000110000011000011011000011011000011011000
01100110000001100000000001100000000001
1000000011001100000001100111001100110001100111011
000111001100000001100011000011000011000
1100110001100110000000001110110001111000001110
11001111011001100000000111110001111110
0011111000011111000110000000100000110000000000
000000000000000000000000000000000000000
00000000000000000000000000000000001111110000000
0000000000000000000000000000000000000
000000000000000000000000000000000000000

(the newlines are there to conform to hbh's layout, its not part of the encryption Pfft)

P.S. its reversible(obviously) and its not to do with the binary itself, more what it represents Pfft




Edited by on 25-04-07 20:40
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Posted on 26-04-07 02:26
OK guys, new update.

i think i went overboard before, it was more or less uncrackable, because that part of the algorithm has no collisions, and i made the salt...vell long and not very bruteable


the new salt is non dictionary but wholly logical


bitchohealey at hotmail dot com skype:richohealey www.psych0tik.net
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Posted on 26-04-07 08:56
Got it. Got the orignal last night with "this_is_the_salt".

The new one was easy though - "richohealey".

"This string is truly splendifourously encrypted using a salt!"

Nice work! Enjoyed it - kept me busy Smile
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Posted on 26-04-07 09:54
@mr noob: "you are 1337".

Very clever... I liked that one!
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Posted on 26-04-07 14:00
Just been playing around a bit more. Just one point to note:

I think that if you copy and paste the chars from the forum post, your decoder would fail. This is due to tabs and carridge returns.

The forum doesn't allow tabs (0x09h) and treats them as spaces (0x20h) which obviously screws up the text when some of the chars are 0x09h. Similarly, where there are any 0x0Ah or 0x0Dh, the forum treats them as carridge returns so when you copy the text, you always get two bytes : 0x0Dh and 0x0Ah. Again, this obviously screws up the text when you have either 0x0Dh or 0x0Ah bytes in the text.

Its also impossible to determine what should have been there because any 0x20h byte could actaully be either 0x20h OR 0x09h (same with 0x0A and 0x0Dh).

The initial Third encryption (which you replaced) has no problem because there are no 0x09h, 0x0Dh or 0x0Ah bytes. The new one however could not be decoded by your decoder.

Hope that makes sense? The way to get around it would be to process the output string (after encoding) and to replace 0x09h, 0x0Ah and 0x0Dh with unique bytes so that a decoder could replace them before going on to the next stages e.g. replace all 0x09h with 0x99h; all 0x0Ah with 0x9Ah and all 0x0Dh with all 0x9Dh.

That would make it tough to crack too.

I need to actually do some work now or I'm gonna get sacked.
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Posted on 28-04-07 01:32
FaTaL: this is sort of a dry run, the new one uses a random function to rearrange the salt, based on the salt.

and the chars will be sent over sockets, so the contents is kinda irrelevant, but thanks for all the feedback.


bitchohealey at hotmail dot com skype:richohealey www.psych0tik.net
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