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 Forum index » Archive » Archive: MetaCortechs » MetaCortechs: Puzzles
[SOLVED] Marcus's Metadex files (dimitri.zip) [Nov 6]
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StreetPreacher
Boot


Joined: 14 Oct 2003
Posts: 32

[SOLVED] Marcus's Metadex files (dimitri.zip) [Nov 6]

Updated files on Marcus' account. Looks like he found someone (Dimitri Moraitopoulos) that found James Avery.

There is also some weird file called tapestry.jpg that looks like it coudl be a stereogram.
1.jpg
 Description   James Avery
 Filesize   21.71KB
 Viewed   422 Time(s)

1.jpg

2.jpg
 Description   James Avery 2
 Filesize   65.6KB
 Viewed   429 Time(s)

2.jpg

3.jpg
 Description   James Avery looking up
 Filesize   54.38KB
 Viewed   431 Time(s)

3.jpg

4.jpg
 Description   James Avery on the ground
 Filesize   24.05KB
 Viewed   434 Time(s)

4.jpg

5.jpg
 Description   James on the ground with someone behind him.
 Filesize   66.93KB
 Viewed   497 Time(s)

5.jpg

tapestry.jpg
 Description   Stereogram maybe?
 Filesize   159.73KB
 Viewed   686 Time(s)

tapestry.jpg


PostPosted: Thu Nov 06, 2003 12:11 pm
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yeahyeah
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Theres already a thread in general about this, didn't seem like a puzzle at that point, its can be found here
If need be, it could be moved here.. Dunno, just wanted to point out that there have already been some observations and speculation on the subject..
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yeahyeah's betamaze generator/decoder


PostPosted: Thu Nov 06, 2003 12:38 pm
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bakntime
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Ok, how about this:

I can see six possible combinations for each "pixel" or square in tapestry:

1) Full solid black
2) solid white
3) black triangle in lower left
4) black triangle in lower right
5) black triangle in upper left
6) black triangle in upper right

By this "method", the first 5 "squares" are:

solid black (1), solid white (2), solid black (1), black triange upper left (5), solid white (2), black triange upper right (6)...

Of course, this number scheme is arbitrary (I just randomly picked which number would be which kind of square).

By this method, we could have every 2 "squares" representing one letter - because there are 6 combinations for each square, 6x6 for 2 square pairs would be 36 combinations...

PostPosted: Thu Nov 06, 2003 12:41 pm
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yeahyeah
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which leaves enough 'address space' for numbers and letters.. but no spaces or special characters
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PostPosted: Thu Nov 06, 2003 1:03 pm
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Nursie
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I posted this:

Nursie wrote:
Quote:
I think tapestry is a form of binary, or even trinary.


That's an assumption I've been thinking about. But it is actually more like base 4, or something.

Basically, the smallest unit here sems to be a 10 by 10 (or thereabouts) pixel square. this can be coloured in one of four ways:






Giving you basically two bits per square in binary. If we have top/left = high bit, bottom/right=low bit and black=0, white=1 then we get:
    = 00 (binary) = 0 decimal
    = 01 (binary) = 1 decimal
    = 10 (binary) = 2 decimal
    = 11 (binary) = 3 decimal

So you could conceivably come up with a long binary string that may be ascii.

The main problem with this approach is the assumptions about which bit is more significant, and which colour is 0/1

Also it'll take hours and hours to decode unless someone writes a nice peice of region growing/vision code, and I've more or less forgotten how to do that since leaving uni.

I like the barcode idea better, it's more automated (and much less effort for us or the pm's). Meanwhile I'll try this approach when I get off work..........


In the general forum, but almost immediately realised I was totally wrong, as there in fact 6 combinations (Thanks bakntime), the four above and these two:




So we've either got a weird base 6 encoding, or two squares to a letter, or some sort of edge direction based code, or an advanced type of barcode.....(or anything else anyone can think of).

On the two squares to a letter thing, we could pick out 'letters' and do a frequency analysis to determine which were what letter. What do you think?
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PostPosted: Thu Nov 06, 2003 1:09 pm
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bakntime
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yeahyeah wrote:
which leaves enough 'address space' for numbers and letters.. but no spaces or special characters


36? That's enough for letters and 10 numbers...

Or letters and some punctuation and spaces...

PostPosted: Thu Nov 06, 2003 1:17 pm
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bakntime
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Just messing around here:

If we assume that 2 blocks = one letter....


==1st block==

= 1
= 2
= 3
= 4
= 5
= 6


==2nd block==

= A
= B
= C
= D
= E
= F

In this fasion, although it's arbitrary, we've got 36 combinations.

Some examples:

1A
4F
3E

Even though the code is arbitrary, each pair of squares has a unique code consisting of the first block (number) and second block (letter)...

Now, from watching the movie "Contact", I'm thinking that maybe the first 62 (36x2) boxes are the "key" to the code. In other words the first 62 boxes represent possibly the entire alphabet plus numbers 0-9 in this manner:

first set of 2 boxes = a
second set of 2 boxes = b
third set of 2 boxes = c

etc...

Therefore, by my guess,

would equal the letter "A"

would equal the letter "B", and so on....



I don't have time to test this right now.... But it's a possibility...

(I hope you don't mind me using your images Nursie)

PostPosted: Thu Nov 06, 2003 1:35 pm
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Nursie
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Quote:
(I hope you don't mind me using your images Nursie)

No Problems.

Boss has gone home now so I'll check that out. The only problem with the key theory there is that the first 62 sets of two boxes would need to be unique.........
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PostPosted: Thu Nov 06, 2003 1:38 pm
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bakntime
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I could be barking up the wrong tree here...

Perhaps this is like a "slide puzzle"

Moving each strip that is one "square" wide either up or down a certain amount will result in some picture becoming evident...

Just another possibility I'm throwing out there.

PostPosted: Thu Nov 06, 2003 1:40 pm
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bakntime
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Nursie wrote:
Quote:
(I hope you don't mind me using your images Nursie)

No Problems.

Boss has gone home now so I'll check that out. The only problem with the key theory there is that the first 62 sets of two boxes would need to be unique.........


Right.. I was thinking that. I wish I had more time to play around with this right now Confused

PostPosted: Thu Nov 06, 2003 1:40 pm
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Tian
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What should be a B occurs more than one time on the first line.

Trying to do this on column leads to the same problem (some patterns are more than one time).

So this cannot be the solution (but it was really a great idea).

PostPosted: Thu Nov 06, 2003 1:46 pm
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WedgeGold
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bakntime wrote:

Now, from watching the movie "Contact", I'm thinking that maybe the first 62 (36x2) boxes are the "key" to the code. In other words the first 62 boxes represent possibly the entire alphabet plus numbers 0-9 in this manner:

first set of 2 boxes = a
second set of 2 boxes = b
third set of 2 boxes = c

etc...


A Primer??????

The file cabinet picture was titled "Grabbing Internet Files, a primer"

could be something there...
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PostPosted: Thu Nov 06, 2003 1:47 pm
Last edited by WedgeGold on Thu Nov 06, 2003 1:54 pm; edited 1 time in total
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bakntime
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Tian wrote:
What should be a B occurs more than one time on the first line.

Trying to do this on column leads to the same problem (some patterns are more than one time).

So this cannot be the solution (but it was really a great idea).


Thanks... it was just something to "throw" out there as a possiblilty.

(by the way, I should have said 72, not 62... 36x2=72 DUH!!!! This is what happens when I think too much).

Anyway, I think it's still possible that there's some kind of code "in there" in the manner I described, but there just may be no "key" to decipher it.

PostPosted: Thu Nov 06, 2003 1:48 pm
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Nursie
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It still doesn't render the underlying principle obsolete, just the key idea. It's still possible to decode using princsiples of frequency of letter occurence in the english language. Assuming of course it is english......

I could swear that I've seen barcode technology like this, but I can't hit the right google search terms just now.
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PostPosted: Thu Nov 06, 2003 1:48 pm
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Worker
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If this is binary (or 6-ary), wouldn't the pattern appear to be more random than it is? The big blobs of white connected to eachother just seem to form way too much of a pattern compared to the black.

I've attached the image with the colors inverted, just for a new perspective.
tapestry_inverted.jpg
 Description   
 Filesize   133.86KB
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tapestry_inverted.jpg


PostPosted: Thu Nov 06, 2003 2:05 pm
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