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 Forum index » Diversions » Perplex City Puzzle Cards » PXC: Silver Puzzle Cards
[Puzzle] #243 Silver - Shuffled Part 2 (Read 1st Post!)
Moderators: AnthraX101, bagsbee, BrianEnigma, cassandra, Giskard, lhall, Mikeyj, myf, poozle, RobMagus, xnbomb
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Author Message
Mindez
Decorated

Joined: 26 Feb 2006
Posts: 165

arnezami wrote:

Although I haven't really worked it out yet I believe this one could work:
Quote:
B A 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 .

Which would be the exact opposite if our default deck.

But all this is a bit arbritrary so I doubt if this is the way to go. Doesn't hurt to try it though Wink.


Didn't work. And I tried swapping jokers, moving jokers to the end, etc.
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PostPosted: Wed Aug 30, 2006 6:45 am
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arnezami
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Joined: 14 Apr 2006
Posts: 136

Mindez wrote:
Didn't work. And I tried swapping jokers, moving jokers to the end, etc.

Doesn't work as in: solitair can never end in this deck order? Or as in: when you try decrypting several different ciphertexts (10/20/108/128 long etc) you don't get anything readable?

PostPosted: Wed Aug 30, 2006 6:48 am
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BrianEnigmaModerator
Entrenched


Joined: 05 Oct 2003
Posts: 1199
Location: Pacific Northwest

Teebor wrote:
Its not difficult really, All you need is a program to randomly generate possible different configurations of the 54 cards...

Sure! Knock yourself out! Feel free to base your brute forcer on the code I wrote slightly over a year ago. My code didn't go through every possible deck order (that would be 2.3x10^71 possibilities, and even at 10 per second, that's several million years worth of combinations.) Since only one or two waves were released at the time, it went on the assumption that the prime numbered puzzle cards (the ones with the playing card symbols on them) were the order necessary for decrypting and that the deck was not keyed. It would then take the "holes" (the prime numbered cards we didn't yet have--we could deduce what playing card symbols would be on them, but not the order), and brute force the arrangement of those. It wasn't quite the pure brute force that you're talking about, but it could be easily modified.

Nothing came from that, unfortunately, even as we got more and more waves of puzzle cards released. Either that's the deck order and there's a key (a theory largely discredited in the wiki), or the standard deck order is correct and there's a key (which isn't a single dictionary word, as some of us have thrown the dictionary at it), or we're looking at this completely wrong.
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PostPosted: Wed Aug 30, 2006 11:16 am
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Teebor
Boot


Joined: 28 Jun 2006
Posts: 67

Right oki thanks, I know what I am having for tea then.

Boy its hard to remember whats been mentioned in all these pages.

PostPosted: Wed Aug 30, 2006 11:43 am
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James Siegesmund
Boot

Joined: 02 Aug 2006
Posts: 26
Location: Denver, CO

brokasaphasia wrote:
James Siegesmund wrote:
cards cards cards A B.

The order of last two (Jokers A and B) might be reversed, as there's no way of knowing which joker it Garnet's deck had a star on it. Thanks!


But I don't think it is possible to end up with a deck that has:
cards A B
cards B A
after a Solitaire count cut. Because that would mean the deck looked like:
A B cards
B A cards
after the jokers move, but you can't move a joker to the top slot of a deck.

Sorry James.


Oh, OK, I think I got what you're saying -- that an "end order" can't have a joker on the bottom because that means a joker would have to have been on top before the triple cut, which in turn means the joker must have been moved to the top by one of the joker moves, which can't happen because the "joker move" steps either put the joker on the bottom or somewhere below the top card. Therefore an end order can't have a joker on the bottom. Gotcha!

As an aside, this may one reason why Solitare has "problems" -- the 54! possible "starting deck orders" (as determined by agreement, or bridge column, or passkey, or whatever) have to map, after even just one keystream letter is generated, to something like (52 * 53!) possible "ending deck orders" (deck order after keystream generation), because an ending deck order can't be one of the (2 * 53!) possible orderings of the deck that has a joker on the bottom. This, in turn, means there can't be a one-to-one correlation between starting and ending deck orders. For any length keystream (inclduing length 1), there are certain non-identical starting deck orders (Deck 1 and Deck 2, say) exist so that after encryption, Deck 1 and Deck 2 have identical ending deck orders. The most obvious pair of different starting decks that have this property is [A, (other 53 cards] and [(other 53 cards), A], which will converge to identical decks of the form [(some card) A (other 52 cards)] after the very first step of keystream generation.

I'm not sure if that helps us get any further in solving this, but it was fun for the math geek in me to chew over for a while. Embarassed

PostPosted: Wed Aug 30, 2006 2:33 pm
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RedZed333
Boot


Joined: 13 Jul 2006
Posts: 24
Location: Sunderland

I've been through the 'Cryptic' posts and I may have a new lead.....

I'm supposing the first part of 'If entropy etc.........' is an anagram, leaving the rest after the comma 'outward looks etc........' as the Classic Cryptic clue.

I came up with.....

Spoiler (Rollover to View):
OPENS IF WINTRY (Anagram of IF ENTROPY WINS


The logic.......

OPENS (OPEN+S = OPENNESS) = Outward looks

IF = Should (taken in the context of 'possibility', 'should you want = if you want'

Finally, this 'leaves you'

WINTRY = Cold

OK......now you can try and do something clever with it or pull it to bits.......

PostPosted: Thu Aug 31, 2006 8:15 pm
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Scribe
Unfettered


Joined: 09 Jun 2006
Posts: 300
Location: Brighton, UK

Heheh, I took this the other way around... i.e. "If entropy wins" indicates that something else is an anagram (entropy = randomness). "Should leave you cold" is the "clue" bit, leaving "outward looks" to be the anagram. I can see two things that fit this:
Spoiler (Rollover to View):

OUTDOOR WALKS and WALK OUTDOORS

Can't get anything by putting either of these as the key, but I've a feeling my deck order might be wrong. Maybe one of these, with one of the 4 possible deck orders garnered from the top of the card?
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PostPosted: Thu Aug 31, 2006 8:37 pm
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Sh1ft
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Joined: 12 Nov 2003
Posts: 110
Location: Salt Lake City, Utah

James Siegesmund wrote:
As an aside, this may one reason why Solitare has "problems" -- the 54! possible "starting deck orders" (as determined by agreement, or bridge column, or passkey, or whatever) have to map, after even just one keystream letter is generated, to something like (52 * 53!) possible "ending deck orders" (deck order after keystream generation), because an ending deck order can't be one of the (2 * 53!) possible orderings of the deck that has a joker on the bottom. This, in turn, means there can't be a one-to-one correlation between starting and ending deck orders. For any length keystream (inclduing length 1), there are certain non-identical starting deck orders (Deck 1 and Deck 2, say) exist so that after encryption, Deck 1 and Deck 2 have identical ending deck orders. The most obvious pair of different starting decks that have this property is [A, (other 53 cards] and [(other 53 cards), A], which will converge to identical decks of the form [(some card) A (other 52 cards)] after the very first step of keystream generation.

I'm not sure if that helps us get any further in solving this, but it was fun for the math geek in me to chew over for a while. Embarassed


What is interesting is that there are really no proven methods to exploit the lower probability bias, nor the exploitation of a weak (short) passphrase.

This statement is particularly bittersweet:

Bruce Schneier wrote:

Remember, though, that there are only about 1.4 bits of randomness per character in standard English. You're going to want at least an 64-character passphrase to make this secure; I recommend at least 80 characters, just in case. Sorry; you just can't get good security with a shorter key.


Well said Bruce! But how could we go about obtaining a deck order based on a weak (again, *short*) passphrase?

PostPosted: Fri Sep 01, 2006 3:22 am
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Kradlum
Boot


Joined: 01 Aug 2006
Posts: 69
Location: London

I spent another couple of hours staring blankly at the card last night trying different thoughts.

A few meta-thoughts on this card - while most of the other silvers have been difficult, I can't think of one that has been particularly complex. I.e. Swarms - once you see the pattern, it is really easy. Same is true of Billion to 1 or Reimann (the answer is not easy, but the puzzle is). I can't think of 1 silver card that is as complex as people suppose Shuffled is. This leads me to think we are over-thinking the problem.

Looking at a few silver threads, the answer, or at least the main drive towards the answer, tends to be on the first page of the thread, after that it tends to be red herrings and nitpicking.

PostPosted: Fri Sep 01, 2006 8:15 am
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fretty
Decorated

Joined: 19 Nov 2004
Posts: 281
Location: South Yorkshire, England

So it's probable that the right method has already been tried in the many pages of posts.

PostPosted: Fri Sep 01, 2006 8:22 am
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FranG
Boot

Joined: 23 May 2006
Posts: 35

I wouldn't be surprised if someone had tried all the parts of the solution, but just not put it all together. We need the right passphrase/deck order, the right ciphertext in the right order, and we need to know how to recognize the solution. If the plaintext comes out scrambled, we could look right at it and not see it.

Unfortunately, there's a gi-normous number of more or less reasonable combinations. I don't see how we can use a distributed attack, though, since there doesn't appear to be a good way to divide it up and keep track. Also, they told us Shuffled didn't need collaboration.

All that makes me think there's a pointer to the solution that we're not seeing. Maybe it's harder to see that they thought it would be. All my inspirations have led exactly nowhere.

Maybe we should try to pin down the elements separately. I think we should stick to the basic description of Solitaire until we're sure it's been fully explored; i.e. use the standard deck order with a passphrase, or some other deck order without a passphrase, and only the operations described by Schneier.

I'm pretty sure it's come up before, but I think we need to back off and take another fresh look at it. Maybe someone could update the Wiki with a revised summary.

PostPosted: Fri Sep 01, 2006 2:11 pm
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RedZed333
Boot


Joined: 13 Jul 2006
Posts: 24
Location: Sunderland

Looking at all of 'if entropy wins........etc' as an anagram.....

Spoiler (Rollover to View):
Look close and you will find out the password, voyeur'


Voyeur being a 'peeping tom', someone peeping into a computer system perhaps......

Maybe pertinant as there is a real 'Peeping Tom' virus that takes over a PC if a webcam is used.

http://www.theregister.co.uk/2004/08/23/peeping_tom_worm/

PostPosted: Sat Sep 02, 2006 10:40 am
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rosemary
Boot

Joined: 05 Aug 2006
Posts: 17

did a quick search and didn't find this already posted.
the phrase "If entropy wins...."
is an anagram for
Spoiler (Rollover to View):
virus was copy, look round you, find how to delete all, S

also
Spoiler (Rollover to View):
fold over words. look until you yield a suspect. who, AN

I've tried these as the passkey and it didn't work, but I thought it might give someone else some ideas. Probably means nothing though!

PostPosted: Mon Sep 04, 2006 4:16 pm
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pheebs
Guest


good going guys, i'll have a think about those ideas and see if something miraculously pops into my head!!

PostPosted: Mon Sep 04, 2006 8:07 pm
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TascoDLX
Greenhorn

Joined: 06 Aug 2006
Posts: 4

RedZed333 wrote:
Looking at all of 'if entropy wins........etc' as an anagram.....

I think I've cracked the anagram code...
Spoiler (Rollover to View):
Who would you suspect and never look for? Sally, idiot!

Oh yes, I've cracked (it).

'Outward looks should leave you cold'. I think I'm starting to understand what that means. Wink

PostPosted: Tue Sep 05, 2006 3:40 am
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