## Image cypher

A forum for good logic/math puzzles.

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Actaeus
Posts: 606
Joined: Thu Jan 10, 2008 9:21 pm UTC
Location: ZZ9 Plural Z Alpha

### Image cypher

cypher1.PNG (18.48 KiB) Viewed 3084 times

Carnildo
Posts: 2023
Joined: Fri Jul 18, 2008 8:43 am UTC

### Re: Image cypher

After about 30 seconds of work, I got this:
Spoiler:
One Million, Four Hundred Fifty Six Thousand, Nine Hundred Twenty Three

Actaeus
Posts: 606
Joined: Thu Jan 10, 2008 9:21 pm UTC
Location: ZZ9 Plural Z Alpha

### Re: Image cypher

Carnildo, great. Keep working at it.

HenryS
Posts: 199
Joined: Mon Nov 27, 2006 9:16 am UTC
Location: Melbourne
Contact:

### Re: Image cypher

Spoiler:
Tried a few things with that number, nothing jumps out... it factors as 3 x 13 x 37357, doesn't look like it's telling us a way to rearrange the pixels into some other rectangle. In hexadecimal it is 163B1B, might encode a colour but I don't see how that would be useful.

Actaeus
Posts: 606
Joined: Thu Jan 10, 2008 9:21 pm UTC
Location: ZZ9 Plural Z Alpha

### Re: Image cypher

HenryS:
Spoiler:
The solution is 31337357... it's l33t

thc
Posts: 643
Joined: Fri Feb 08, 2008 6:01 am UTC

### Re: Image cypher

HenryS
Posts: 199
Joined: Mon Nov 27, 2006 9:16 am UTC
Location: Melbourne
Contact:

### Re: Image cypher

Actaeus wrote:HenryS:
Spoiler:
The solution is 31337357... it's l33t
Spoiler:
Sorry, I must be missing how you get that from the number? It isn't base 8...

HenryS
Posts: 199
Joined: Mon Nov 27, 2006 9:16 am UTC
Location: Melbourne
Contact:

### Re: Image cypher

Here's an entirely different image cypher (I was playing this kind of game on a different forum some time ago).
Attachments
texture_challenge4.png (420.16 KiB) Viewed 2923 times

crzftx
Posts: 371
Joined: Tue Jul 29, 2008 4:49 am UTC
Location: Rockford, IL

### Re: Image cypher

Actaeus wrote:Image

So now that the solution's out, how do you figure?

Actaeus
Posts: 606
Joined: Thu Jan 10, 2008 9:21 pm UTC
Location: ZZ9 Plural Z Alpha

### Re: Image cypher

crzftx wrote:
Actaeus wrote:Image

So now that the solution's out, how do you figure?

Huh?
HenryS wrote:
Spoiler:
Sorry, I must be missing how you get that from the number? It isn't base 8...

Spoiler:
Look at those factors again.

Spoiler:
First, I chose my 1337 number/word and split it up into primes of increasing magnitude. I multiplied them together, converted to English text, and ROT13'd. Then I took the resulting image and XOR'd it with random pixels. The result, along with the random pixels, are the ciphertext.

crzftx
Posts: 371
Joined: Tue Jul 29, 2008 4:49 am UTC
Location: Rockford, IL

### Re: Image cypher

Actaeus wrote:
Spoiler:
First, I chose my 1337 number/word and split it up into primes of increasing magnitude. I multiplied them together, converted to English text, and ROT13'd. Then I took the resulting image and XOR'd it with random pixels. The result, along with the random pixels, are the ciphertext.

Still lost
Spoiler:
I get up to "Bar Zvyyvba, Sbhe Uhaqerq Svsgl Fvk Gubhfnaq, Avar Uhaqerq Gjragl Guerr". Then you take the resulting image (here's the problem, what is your string to image function?) and XOR it with a random image. You posted the XOR on top and the random image on the bottom.

I can see no obvious way to convert a string to bits (considering the lengths). The string is 71 characters, while the bit pattern has 129540 bits.

Yat
Posts: 131
Joined: Tue Feb 03, 2009 2:05 pm UTC

### Re: Image cypher

crzftx, you should try and solve this puzzle before trying to do the encryption again. If you had
Spoiler:
xored the two parts of
the given image, you will see how obvious the obvious way to convert a string to an image is.