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 Forum index » Diversions » Perplex City Puzzle Cards » PXC: Silver Puzzle Cards
#242 silver star set ciphers of history
Moderators: AnthraX101, bagsbee, BrianEnigma, cassandra, Giskard, lhall, Mikeyj, myf, poozle, RobMagus, xnbomb
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Grizy
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Joined: 19 Nov 2005
Posts: 89
Location: Preston, UK

Fuseunderground,
I think your grid is close to where i came in on this puzzle. Apparently there are prime numbers in the cipher which a grid that uses multiplication can't handle.
The simplicity of the 24 by 25 grid just counting each cell sequentially is:-
It covers all numbers between 1 & 600.
It "Count"s with ref to vons clue.
It points to 2 letters in sequence for each number.

The downside is that the output is gibberish. The text may become clearer by rotating the grid but I haven't got that far yet.

Saturday night and the beer is calling.

PostPosted: Sat Jan 21, 2006 3:08 pm
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hally
Boot

Joined: 10 Jan 2006
Posts: 35
Location: Thatcham, Berkshire

I now have two sets of letters:

The Original (possibly wrong)

IA NO AH LW
KE SZ OU ME
ET HW SA BY HX
FN IZ IM
IN AE
TX RY
MA ST

The New Letters

IY NN AH LR
KD SY OT MD
ES HV RZ BX HW
FM IY IL
IM AE
TW RX
LZ SS

Now I'm in a muddle because the whole exam thing in the first set of letters seems spot on. Perhaps the message is a combination of the two sets.

PostPosted: Sat Jan 21, 2006 3:18 pm
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ALISDAIRPARK
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Joined: 27 Nov 2005
Posts: 1646
Location: Everywhere else

I get a completely different set of numbers, but stil not making sense
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PostPosted: Sat Jan 21, 2006 4:03 pm
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hally
Boot

Joined: 10 Jan 2006
Posts: 35
Location: Thatcham, Berkshire

What letters are you getting ALISDAIRPARK?

PostPosted: Sat Jan 21, 2006 5:01 pm
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Fuseunderground
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Joined: 17 Dec 2005
Posts: 151

Sorry, yes I realise that my grid couldn't cope with primes,
I was just stating another way 25x24 could make 600.

Wasn't there a translation a while back with no primes?

I am thinking the message could be something like
"...what is the answer to question 13?"
which would mean a prime could indicate an actual number.

Alternatively it could be along the lines of
"...I fancy 'X' " which would include a name.

Just more food for thought,
I'm sure the Perplexians would have much
more 'high-brow' notes though Wink

PostPosted: Sat Jan 21, 2006 5:33 pm
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Grizy
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Joined: 19 Nov 2005
Posts: 89
Location: Preston, UK

None of the suggested options are without merit.

Von's clue states
Spoiler (Rollover to View):
Count ont his cipher being twice as hard as it looks


This leads us to believe that there are two stages to decrypt the cipher.

Is stage 1 to convert Hebrew numbers to decimal? This seems to me to be just being able to read Hebrew numbers.

The XY=600 is clearly legible, where the other equation is not. Does this point to using a grid where the xy point is 600? X & Y are commonly used as axese but the largest number in the cipher is 533 (24*22approx).

Then there is the faint lettering which mirrors the cipher, albeit bigger and rotated clockwise 90 degrees. Is this a clue to rotate the grid?

My heads hurting now. Might be the beer. Gnight.

PostPosted: Sun Jan 22, 2006 12:36 am
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ramsfan
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Joined: 07 Sep 2005
Posts: 232
Location: holmfirth, yorks

I thought I'd summarise the different strands, partly cos I'm getting confused, but also cos last time I did this, someone corrected my mistakes, then the next person provided the answer. I've simplified it to the extent that I've not included all the alternative numbering systems you come across.

The letters appear to be Hebrew rather that Yiddish. That's been confirmed by a Hebrew speaker and also I took my card to a batmitzvah (no one asked me to play). It can't be translated directly. That might be different if we manipulated the letters as below, but seems unlikely to be required.

Hebrew reads right to left, but the way everything lines up to the left, suggests it should be read left to right. The shadowy letters suggest the possibility of a 90 degree rotation, possibly of numbers on a grid.

The two main manipulations are called Atbash and Atlam. They assume the standard 22 letter alphabet. Atbash then swaps 1 for 22, 2 for 21 etc. Atlam does a rot11 on them, ie 1 becomes 12 etc. The thing against both of these is that the 4th letter in the 4th line appears to be the 23rd letter, added for numerical purposes.

The other way of translating letters into numbers is called Gemetria. It's the same as the standard numbering up to 10. Then it goes in multiples of 10 up to 100, then in multiples of 100. The standard 22 letter alphabet only goes up to 400, but extra letters have been added to cover 500-900 (hence my referring to the 23rd letter).

Applying Gemetria to the message provides the solution which starts with 208. They all make sense until the 1st letter of the 6th line which is a 5 where it should be a 500 (or other multiple of 100). Von's hint could apply here. It suggests that a group or groups of letters should be separated so that one letter goes to the other letter group. Perhaps this group should be separated into 5 and 17. Grizy's ingenious suggestion is that this group indicates numbers, eg a meeting time. Von's hint starts with count which may support gemetria, but could equally apply to the standard numbering of the 22 letter alphabet. The rest of the message could just indicate the complexity of our task, or could mean we have to halve or double the answers.

XY=600 points to the numbers being translated into 2 letter combinations. Gemetria produces some numbers which can't be translated, eg 305, which factors into 5 and 61. Grizy's grid deals with this by numbering the letter combinations sequentially. Unfortunately it doesn't provide as likely looking answers as Hally, who had used a straightforward factor grid but made some errors.

So come on. The next person tell me what I've got wrong and the one after that, give us the answer. I can feel we're almost there.
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PostPosted: Sun Jan 22, 2006 4:04 am
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BBuck
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Joined: 13 Dec 2005
Posts: 184

Sorry to say that I think you've got it all pretty spot on...

The only thing I'd sort of disagree with is

Quote:
Grizy's grid deals with this by numbering the letter combinations sequentially. Unfortunately it doesn't provide as likely looking answers as Hally, who had used a straightforward factor grid but made some errors.


We are dealing with a number of ciphers (from the title). It may be we need to do Gematria (Hebrew to numbers), a grid (numbers to letters) and a final cipher (gibberish to proper English). So it will be difficult to tell which grid produces more likely looking answers.

In my post back on page 4 of this thread, I suggested another type of grid: 26*26 and numbered sequentially, but starting at XY=600, and working back, which would make AX=1. (Doublecross pointed out that I'd been arbitrary in my choice of how to number: I'd used AA=1, AB=1, etc, but AA=1, BA=2 is also a possibility). I agree that a 24*25 grid seems a bit odd, and so thought the XY=600 was not only showing that each number represented a digraph, but also where to start the numbering in the grid.

Going on the first grid, I got IWOKBE--MPLATVPQNAFPISSWCUITGJVJ--UWJJ----BB--UT--SU--MW----TP-- (the -- are where I speculated that there may be letters missing: I still think the gaps are significant somehow).

In the same way as Grizy's letters, this doesn't look as friendly as the letters Hally got, but might be a Vigenere cipher. My main reason for thinking of Vigenere is that to break a short message (ie too little ciphertext to look for repetitions of groups of letters, then do a frequency analysis on every nth letter), you need to guess some of the plaintext correctly, and we are given the name of the Professor on the card, so I thought the message had to contain something like "Hale is boring". Not got anywhere with that, though.

Realise this doesn't move us forward much, but thought it worth mentioning this type of grid system down here with the others.

PostPosted: Sun Jan 22, 2006 7:20 am
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ALISDAIRPARK
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Joined: 27 Nov 2005
Posts: 1646
Location: Everywhere else

Yeah I think most of the thought streams are there. I'm going to pull together a flowchart to show the various options, which might help clarify things - or at least we can be more systematic and cross things off once done.

On that point I think we need to peer review outputs. By this I don't mean we all need to agree the one form of grid is right, but that based on the grid used no errors have been made etc. so basically double checking our work. Let's face it it's easy to make errors!

Just on the grid debate, if we went for the values based on multiplication we end up with numbers not on the grid and duplicates, so I don't think it's that. Likewise I don't think we are supposed to work back from a number, getting it's factors and trying to determine the original letters as there are so many permutations to that. (see my previous post).
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PostPosted: Sun Jan 22, 2006 10:23 am
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Maxamus
Boot

Joined: 18 Dec 2005
Posts: 13

Hi been following the progress

i think you are pretty close but i think you are not using enough letter grids
a few pages ago someone mentioned a Two-hill cipher
this was one ordinary alphabet and the rest of the letters where in a different order in the second grid

Has anyone tried this yet
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PostPosted: Sun Jan 22, 2006 12:57 pm
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BBuck
Decorated

Joined: 13 Dec 2005
Posts: 184

I'm not sure what you mean by Two-hill cipher (can't find the reference in the thread).

PostPosted: Sun Jan 22, 2006 1:12 pm
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ALISDAIRPARK
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Joined: 27 Nov 2005
Posts: 1646
Location: Everywhere else

Ok this is a basic flowchart of options. If anyone thinks of other routes let me know and I will update it.

EDIT: Included book code, and character spacings.
CIPHERS OPTIONS.doc
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_________________
Absorb what is useful <> Reject what is not <> Add what is uniquely your own
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PostPosted: Sun Jan 22, 2006 2:27 pm
Last edited by ALISDAIRPARK on Sun Jan 22, 2006 6:37 pm; edited 1 time in total
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Maxamus
Boot

Joined: 18 Dec 2005
Posts: 13

Sorry looks like it wasent mentioned earlier but i found this and it has some relevance to do with the grids

http://en.wikipedia.org/wiki/Two-square_cipher

It could also fit in with Vons clue
Spoiler (Rollover to View):
Count ont his cipher being twice as hard as it looks


As there are two grids and Von said it would be twice as hard
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PostPosted: Sun Jan 22, 2006 3:06 pm
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Maxamus
Boot

Joined: 18 Dec 2005
Posts: 13

OK i put Vons clue into the search engine and it came up with this

http://en.wikipedia.org/wiki/User_talk:Ww

If its been covered before i apoligise but i thought it might be useful
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PostPosted: Sun Jan 22, 2006 3:10 pm
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ALISDAIRPARK
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Joined: 27 Nov 2005
Posts: 1646
Location: Everywhere else

The 2 square cipher looks interesting, although based on what it says it looks like brute force is our only hope of cracking it. there isn't enough text and the only duplicate at all is in the atbashed text.
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PostPosted: Sun Jan 22, 2006 3:25 pm
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