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 Forum index » Diversions » Perplex City Puzzle Cards » PXC: Silver Puzzle Cards
[PUZZLE] #251 - Silver - The Thirteenth Labour - READ POST#1
Moderators: AnthraX101, bagsbee, BrianEnigma, cassandra, Giskard, lhall, Mikeyj, myf, poozle, RobMagus, xnbomb
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Kradlum
Boot


Joined: 01 Aug 2006
Posts: 69
Location: London

 		I'm also getting the congestion message after downloading the client today.

PostPosted: Fri Aug 11, 2006 5:18 pm
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poozleModerator
Entrenched

Joined: 15 Aug 2005
Posts: 1090

 		Well it works here, so its not a server problem.

PostPosted: Fri Aug 11, 2006 6:34 pm
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Kradlum
Boot


Joined: 01 Aug 2006
Posts: 69
Location: London

 		Are you sure? The address in the config file is unpingable.

PostPosted: Sat Aug 12, 2006 5:13 am
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Ringtail
Boot


Joined: 07 Jul 2006
Posts: 22

 		My client seems to have stopped at the moment too, as of 8:35am GMT it's been flashing 'Waiting For Server Response...'

PostPosted: Sat Aug 12, 2006 6:03 am
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Cabbage
Unfettered


Joined: 22 May 2006
Posts: 320
Location: North-East England, UK

 		Yeah, my client has been running overnight but stopped at 9:16 BST this morning waiting for a server response.

Restarted (10:00am BST) and still waiting for a response from the server after ten minutes. Definitely not normal...

All part of the conspiracy?
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Only connect.

PostPosted: Sat Aug 12, 2006 6:11 am
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poozleModerator
Entrenched

Joined: 15 Aug 2005
Posts: 1090

 		Still running fine for me, guessing its back up now.

PostPosted: Sat Aug 12, 2006 6:38 am
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x
Guest


 		i dont know whats up, but looking at mikes countdown page, number of people being able to do wu has plumeted from 1.5 a sec to 0.15, somethings gone wrong

PostPosted: Sat Aug 12, 2006 6:57 am
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Cabbage
Unfettered


Joined: 22 May 2006
Posts: 320
Location: North-East England, UK

 		Up again now thanks, from 11:40 BST

Cheers
Cabbage
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PostPosted: Sat Aug 12, 2006 7:45 am
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Kradlum
Boot


Joined: 01 Aug 2006
Posts: 69
Location: London

 		Yep! Thanks.

PostPosted: Sat Aug 12, 2006 10:37 am
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chimera245
Decorated

Joined: 09 Mar 2006
Posts: 209

 		ra ra ra

10 million

ra ra ra

Carry on

PostPosted: Sun Aug 13, 2006 8:32 am
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Misroi
Veteran

Joined: 03 Apr 2006
Posts: 133

 		Just received this bug report:

Application has generated an exception that could not be handled.

Process id=0xf6c (3948), Thread id=0x848 (2120).

There's also an error message that shows up when I try to debug it, but I think that's more a function of me not having the proper debugging tool than a bug.

PostPosted: Mon Aug 14, 2006 2:54 pm
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themandotcom
Veteran


Joined: 28 Apr 2006
Posts: 136
Location: Syosset, New York, USA, Earth, Milky Way Galaxy, Universe

 		Hi, Im just wondering if we can try a differential cryptanaylsis on this ciphertext. I know 12 rounds is pretty hard, but then we can cross reference the findings with the keys done at the brute force attack. I know this may not be feisable, but I'm sure there are people willing to give the algorithm to us. Or maybe the honorable Chimera can come work his godly like computer skills once again.
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13th Labour!

PostPosted: Tue Aug 15, 2006 12:49 pm
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mac_monkey
Decorated

Joined: 25 Feb 2006
Posts: 250
Misroi wrote:
Just received this bug report:

Application has generated an exception that could not be handled.

Process id=0xf6c (3948), Thread id=0x848 (2120).

There's also an error message that shows up when I try to debug it, but I think that's more a function of me not having the proper debugging tool than a bug.


Make sure you're running .net and try clearing the text file containing the work unit numbers.

themandotcom wrote:
Hi, Im just wondering if we can try a differential cryptanaylsis on this ciphertext. I know 12 rounds is pretty hard, but then we can cross reference the findings with the keys done at the brute force attack. I know this may not be feisable, but I'm sure there are people willing to give the algorithm to us. Or maybe the honorable Chimera can come work his godly like computer skills once again.


I'm not really understanding what you want to do? Do you want to manually cross check a few keys, or are you looking for a different decryption method? If it's the first you're after then we can't cross check I'm afraid, AFAIK the decrypted text isn't stored in the database, as this is too inefficient. Instead we are checking for readable output, and dumping it if we dont get that. That'd be some huge database if it had 14.7million ^2 chunks of ascii in it. I guess it's big enough as it is.

Could you clarify what you're asking please? Laughing
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PostPosted: Tue Aug 15, 2006 1:20 pm
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themandotcom
Veteran


Joined: 28 Apr 2006
Posts: 136
Location: Syosset, New York, USA, Earth, Milky Way Galaxy, Universe
mac_monkey wrote:
Could you clarify what you're asking please?


Sure, I was wondering if differential cryptanaysis would be practical to implement. From reading wiki and Applied Cryptography, I come to find that differential cryptanaysis picks 2 plaintexts pairs and 2 ciphertext pairs of the same length apart and subtracts them to find probablities of keys. I know 2^44 is much bigger than we are doing, but we know that like 10 million keys are not what we are looking for. So can't we find some probable keys to supplement the brute force? I'm sorry if this is wrong, but maybe this can help the card be solved faster (hopfully by the end of Season 1Laughing)
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13th Labour!

PostPosted: Tue Aug 15, 2006 3:09 pm
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BrianEnigmaModerator
Entrenched


Joined: 05 Oct 2003
Posts: 1199
Location: Pacific Northwest
themandotcom wrote:
Sure, I was wondering if differential cryptanaysis would be practical to implement. From reading wiki and Applied Cryptography, I come to find that differential cryptanaysis picks 2 plaintexts pairs and 2 ciphertext pairs of the same length apart and subtracts them to find probablities of keys.


If you have a second piece of text that was encoded with the same key as was used in 13th Labour, then go right ahead. Smile Most of the exploitable "flaws" (although maybe "properties" might be a better term) in cryptosystems are only exploitable when you have more than one ciphertext, more than one plaintext, you can choose the message(s) you want to encrypt, etc. When you are presented with only a single ciphertext message (and told the algorithm that was used), in most cases (and certainly in ours) your only option is brute force. That's what we are doing. Differential cryptanalysis would be a good path to follow if we had two messages encoded with the same key, but we don't.
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Y0 Resources / VP Wiki / PXC Catalog / Metacortex

PostPosted: Tue Aug 15, 2006 8:02 pm
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