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Author Topic: I have pasted my wallet.dat base64-encoded, crack it and the contents are yours  (Read 2955 times)
Gareth Nelson
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September 02, 2011, 12:33:13 AM
 #1

It's also encrypted with an XOR one-time pad on linux using /dev/urandom:

http://sprunge.us/FDGR


If someone cracks it, all I ask is you tell me how you did so.
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PwrLeveld
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September 02, 2011, 12:36:16 AM
 #2

Looks, thinks for a second, fuck it.
Gareth Nelson
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September 02, 2011, 12:39:03 AM
 #3

Looks, thinks for a second, fuck it.

Is that a "fuck it, i can't do this?" or a "fuck it, i'll crack it" ?
Vladimir
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September 02, 2011, 12:40:18 AM
 #4

Quote
XOR one-time pad on linux using /dev/urandom

didn't even look at it, I pass

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PwrLeveld
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September 02, 2011, 12:43:59 AM
 #5


Is that a "fuck it, i can't do this?" or a "fuck it, i'll crack it" ?

Its a Fuck I would rather get hit by another hurricane and lose power for 3-4 days then even try.
greyhawk
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September 02, 2011, 12:46:13 AM
 #6

encrypted with an XOR one-time pad on linux using /dev/urandom:

No thanks.
wolftaur
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September 02, 2011, 12:46:32 AM
 #7

Quote
XOR one-time pad on linux using /dev/urandom

didn't even look at it, I pass

If I'm going to turn random data into a wallet, I'd rather turn it into the mybitcoin scammer's wallet. Then I'd have sooooo many coins. Smiley

(If you don't get how that makes logical sense go read up on OTPs...)

"MOOOOOOOM! SOME MYTHICAL WOLFBEAST GUY IS MAKING FUN OF ME ON THE INTERNET!!!!"
bosschair
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September 02, 2011, 12:56:56 AM
 #8

If that file you posted is XOR'd with data from /dev/urandom, I think your /dev/urandom is broken.
Gareth Nelson
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September 02, 2011, 12:57:44 AM
 #9

There is a weakness in it, i'm not going to reveal it - want to see if anyone in this community spots it.

A professional cryptographer would spot it in seconds.
Gareth Nelson
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September 02, 2011, 12:58:29 AM
 #10

If that file you posted is XOR'd with data from /dev/urandom, I think your /dev/urandom is broken.

Do tell!
Have you found the weakness?
bosschair
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September 02, 2011, 01:02:49 AM
 #11

The file is just a PNG of some kind of masonic symbol.
Gareth Nelson
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September 02, 2011, 01:05:02 AM
 #12

The file is just a PNG of some kind of masonic symbol.


With the right key of course it is Wink

But that's not the point here
fcmatt
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September 02, 2011, 01:26:12 AM
 #13

I guess the only thing i can think of is that urandom is not as good as random.
As in it might just use a seed number. Also he appears to have limited his characters to printable stuff?
sveetsnelda
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September 02, 2011, 01:30:45 AM
 #14

There is a weakness in it, i'm not going to reveal it - want to see if anyone in this community spots it.

A professional cryptographer would spot it in seconds.
I see it as well.  Maybe I'll give it a go tonight if nobody else gets around to it.

14u2rp4AqFtN5jkwK944nn741FnfF714m7
Gareth Nelson
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September 02, 2011, 01:39:18 AM
 #15

I guess the only thing i can think of is that urandom is not as good as random.
As in it might just use a seed number. Also he appears to have limited his characters to printable stuff?

It's base64 encoded silly.

Clue:
wallet.dat has structure and urandom is not truely random
sveetsnelda
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September 02, 2011, 01:40:48 AM
 #16

I see it as well.  Maybe I'll give it a go tonight if nobody else gets around to it.
Nevermind...   found 0.10 BTC.  Your urandom is certainly broken.  It wasn't XOR'd at all...

14u2rp4AqFtN5jkwK944nn741FnfF714m7
fcmatt
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September 02, 2011, 01:41:44 AM
 #17

I guess the only thing i can think of is that urandom is not as good as random.
As in it might just use a seed number. Also he appears to have limited his characters to printable stuff?

It's base64 encoded silly.

Clue:
wallet.dat has structure and urandom is not truely random

yea.. i was hoping to correct my post before someone quoted me..
and b64decode seems to have trouble with it on fbsd. no begin line. i will google.
ah.. -r fixed that issue.. but it seems i am too late.

But I am very curious what the solution was.
Gareth Nelson
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September 02, 2011, 01:42:18 AM
 #18

I see it as well.  Maybe I'll give it a go tonight if nobody else gets around to it.
Nevermind...   found 0.10 coins.  Your urandom is certainly broken.  It wasn't XOR'd at all...

LOL

Well done, for the record here's the correct one:
http://sprunge.us/PcLi
sveetsnelda
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September 02, 2011, 01:43:51 AM
 #19

*That* looks better.  Now let's take a look...  Cheesy

14u2rp4AqFtN5jkwK944nn741FnfF714m7
Gareth Nelson
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September 02, 2011, 01:44:29 AM
 #20

*That* looks better.  Now let's take a look...  Cheesy

You have the plaintext, don't do the obvious to crack it
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