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Challenge #15 - Dedicated to BDV


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#1 MichaelZ

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Posted 02 September 2011 - 11:28 PM

This challenge is dedicated to BDV (and of course to Team Reboot and to reboot.pro).
I hope you enjoy solving it.

Posted Image

http://michael-zoell...description.pdf
http://michael-zoell...enge15image.png

You can also download it here plus you have the possibility to check your solution.

Many Greetings
MichaelZ

P.S. I don't know how to operate the new forum software. I wasn't able to attach those two files. I hope you have no problem to download them using the links.

#2 Icecube

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Posted 03 September 2011 - 12:47 PM

Hidden in the PDF:
Spoiler

Which refers to:
Spoiler

This site might be handy:

I am currently stuck at that point.

#3 MichaelZ

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Posted 03 September 2011 - 12:52 PM

I am currently stuck at that point.

That's what I was hoping ;)
BTW, what you found is hidden twice...

Many Greetings
MichaelZ

#4 Wonko the Sane

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Posted 03 September 2011 - 01:36 PM

Text/message is seemingly too short/has no repeated sequences to crack it with the Charles Babbage technique. :(
http://www.simonsing...ere_cipher.html
http://www.simonsing...e_cracking.html

:cheers:
Wonko

#5 Icecube

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Posted 07 September 2011 - 03:00 PM

Found the hidden text at the second place:
Spoiler

Replacing "1523 1596" with the appropriate cipher alphabeth:
ABCDEFGHIJ

0123456789
I get "BFCDBFJG" as key.

The "decrypted" message, doesn't make much sense:
LOTNSGVHOFURINOOZASJWHU

P.S.: I just noticed that the hidden text is not easily retrievable in Acrobat Reader. Evince PDF reader, allowed me to select the text behind the black box. LibreOffice (and probably OpenOffice.org) can open the PDF and allow you to move the black box too so you can see the text.

#6 MichaelZ

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Posted 07 September 2011 - 03:18 PM

I get "BFCDBFJG" as key.
The "decrypted" message, doesn't make much sense

Hi Icecube,

it doesn't make much sense because it is not the message... (because it is not the correct key...)

Spoiler


Many Greetings
MichaelZ

#7 Icecube

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Posted 07 September 2011 - 03:35 PM

I noticed before that the F and R in the image are a bit highlighted. But I am not sure if it is on purpose or not.

#8 Wonko the Sane

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Posted 07 September 2011 - 03:52 PM

I get "BFCDBFJG" as key.

The "decrypted" message, doesn't make much sense:

LOTNSGVHOFURINOOZASJWHU



But it could be a fine sample of Vogon poetry. :ph34r:
http://en.wikipedia....ki/Vogon#Poetry

In my crystal ball I saw ALTJTHTO :w00t:

The decoded message doesn't make ANY sense either. ;)

MICHAELZPZDLQLEGAUBDEFK


Unless first part is the name of someone :whistling: and second part is the censored adjectives quite a few people are throwing at him/her. ;)

:rofl:

:cheers:
Wonko

#9 MichaelZ

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Posted 07 September 2011 - 03:56 PM

I noticed before that the F and R in the image are a bit highlighted. But I am not sure if it is on purpose or not.

No it's not on purpose. I didn't even notice before. I can asure that the key is not in the graphic.

Many Greetings
MichaelZ

#10 MichaelZ

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Posted 07 September 2011 - 04:00 PM

[...] quite a few people are throwing at him/her. ;)

Hej, I don't want to be thrown at :dubbio:

Many Greetings
MichaelZ

#11 Wonko the Sane

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Posted 07 September 2011 - 04:08 PM

Hej, I don't want to be thrown at :dubbio:

Well, then maybe it is time to do what you promised:

I have no idea if this challenge is too easy or too difficult. Please let me know when I
shall give some hint.


And be a little bit less §@ç#ing optimist! :w00t:

But similar challenges were solved that fast so that I’m quite
optimistic that it is doable.


;)

:cheers:
Wonko

#12 MichaelZ

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Posted 07 September 2011 - 04:12 PM

I can asure that the key is not in the graphic.

Another hint: Hey, we are IT people, aren't we? Probably IT knowledge required?

Many Greetings
MichaelZ

#13 Icecube

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Posted 07 September 2011 - 04:14 PM

Of course it is doable it the key is not to long (brute force :good: ), but that shouldn't be the purpose of the challenge, I hope.

#14 MichaelZ

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Posted 07 September 2011 - 04:17 PM

Of course it is doable it the key is not to long (brute force :good: ), but that shouldn't be the purpose of the challenge, I hope.

The length of the text and key were selected in such a way that I think a brute force is impossible/not very likely to succed. As I mentioned before, it knowlege is required...

Many Greetings
MichaelZ

#15 MichaelZ

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Posted 07 September 2011 - 04:48 PM

And be a little bit less §@ç#ing optimist


Hi Wonko,

in the past I was always impressed by your knowledge of the English language. But now...

I think §@ç#ing optimist is correctly spelled φϋ¢к¥йг optimist :music_guitar: :whistling:

Many Greetings
MichaelZ

#16 Wonko the Sane

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Posted 07 September 2011 - 07:10 PM

I think §@ç#ing optimist is correctly spelled φϋ¢к¥йг optimist :music_guitar: :whistling:


It depends on the dialect, your spelling seems rusglish, a pure L337 would be PhU(|<1|\|9 or /=|_|(|<!/V6 or fux!n9, I am pretty sure that down under they use something like ɟnɔʞıuƃ ;), I think there is not one "recommended".

:cheers:
Wonko

#17 MichaelZ

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Posted 07 September 2011 - 08:59 PM

I think there is not one "recommended".


I like the down under! :thumbsup: :thumbsup: :thumbsup:

#18 Icecube

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Posted 07 September 2011 - 09:10 PM

I can asure that the key is not in the graphic.

Is it visible in the PDF as plain text or in the hexdump of the PDF as plain text?

#19 MichaelZ

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Posted 08 September 2011 - 07:12 AM

Is it visible in the PDF as plain text or in the hexdump of the PDF as plain text?

I like HxD very much (although I also like Tiny Hexer for which I have Jaclaz Wonko plugins).

Many Greetings
MichaelZ

#20 windy

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Posted 08 September 2011 - 09:19 PM

Is one meant to put "THE********IS**********" or just the password into the checker?

I get a result of "Duplicate entry '0' for key 1"

#21 Holmes.Sherlock

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Posted 09 September 2011 - 12:16 AM

Is one meant to put "THE********IS**********" or just the password into the checker?

I get a result of "Duplicate entry '0' for key 1"

Congratulations windy!! What I can see that your answer is absolutely correct.

#22 Holmes.Sherlock

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Posted 09 September 2011 - 03:02 AM

@windy
Can you please try again & let us know?

#23 MichaelZ

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Posted 09 September 2011 - 05:09 AM

Is one meant to put "THE********IS**********" or just the password into the checker?

windy, also many congratulations from me!

Many Greetings
MichaelZ

#24 windy

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Posted 09 September 2011 - 08:37 AM

@Sherlock

The checker is working now, thankyou. :)

I've only just started looking at these challenges and I am finding them an entertaining diversion.I've done 13 but still stuck on 14 :confused1:

#25 Holmes.Sherlock

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Posted 09 September 2011 - 08:43 AM

@Sherlock

The checker is working now, thankyou. :)

I've only just started looking at these challenges and I am finding them an entertaining diversion.I've done 13 but still stuck on 14 :confused1:

Good to listen that you are enjoying the challenges. Thanks to my Team Reboot companions & forum members.




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