Challenge

The fear of every surveillance society: citizens protecting their own privacy with strong cryptography

Challenge

Post by r-ID on Tue Sep 08, 2009 3:10 pm
([msg=29366]see Challenge[/msg])

This is an easy challenge, you don't need to use any math here. It's easier to use this cipher than ceasar cipher.

Because it's simple substitution cipher, i'm giving short example only:

Plaintext: code
Ciphertext: VPFR

Tip: think different

updated challenge: OWEAIBUDUXLRUIB
(using same algorithm but different "shift")

old challenge: O LMPE YJR SMDERT

Posts below contain unhidden spoilers
Last edited by r-ID on Fri Sep 11, 2009 3:47 pm, edited 2 times in total.
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Re: Challenge

Post by Spectre557 on Tue Sep 08, 2009 4:14 pm
([msg=29368]see Re: Challenge[/msg])

I think I have the solution (in black so as not to spoil the fun for anyone else):

<<I KNOW THE ANSWER>>
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Re: Challenge

Post by r-ID on Tue Sep 08, 2009 5:27 pm
([msg=29374]see Re: Challenge[/msg])

Have you found an "algorithm"?
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Re: Challenge

Post by Spectre557 on Wed Sep 09, 2009 11:16 am
([msg=29411]see Re: Challenge[/msg])

r-ID wrote:Have you found an "algorithm"?

Uhmm... No. :oops:

I'm afraid my cryptanalysis skills are currently limited to twenty minutes on Ma's Reversing, so I only decrypted the string by guesswork for the moment.

I really should look into cryptography more...

-- Wed Sep 09, 2009 4:17 pm --

r-ID wrote:Have you found an "algorithm"?

Uhmm... No. :oops:

I'm afraid my cryptanalysis skills are currently limited to twenty minutes on Ma's Reversing, so I only decrypted the string by guesswork for the moment.

I really should look into cryptography more...
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Re: Challenge

Post by tarantulas on Wed Sep 09, 2009 11:31 am
([msg=29413]see Re: Challenge[/msg])

APNYUMH PY FP QUYG NT LRTGPEF?

about right?
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Re: Challenge

Post by r-ID on Thu Sep 10, 2009 10:09 am
([msg=29444]see Re: Challenge[/msg])

tarantulas wrote:APNYUMH PY FP QUYG NT LRTGPEF?

about right?


i have no idea what that means.

-- Thu Sep 10, 2009 10:17 am --

it is important to find an "algorithm" too.
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Re: Challenge

Post by tarantulas on Fri Sep 11, 2009 1:57 pm
([msg=29495]see Re: Challenge[/msg])

Do we need to find and algorithm if you have already said its a simple substitution cypher?

I thought it was a keyboard thing. if 'code' = 'vpfr' look at your keyboard (assuming it is qwerty):

c is adjacent to v
o is adjacent to p
and so on...

It seemed consistent halfway through Spectre557's solution, so I thought that must be it. Heck of a coincidence?
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Re: Challenge

Post by sandsphinx on Fri Sep 11, 2009 2:01 pm
([msg=29496]see Re: Challenge[/msg])

that is one hell of a cool encryption, haha, imagining telling a friend to decrypt it and then he spends hours ceaser brute forcing, haha got me for a bit aswell....
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Re: Challenge

Post by r-ID on Fri Sep 11, 2009 3:53 pm
([msg=29504]see Re: Challenge[/msg])

it's really easy to use this cipher ;) I call it "Typo" :D I personally use it when i want to encrypt some text quickly, no need to think about any algos or to do any math. Key shifting might be changed to any other and might be mixed. Enjoy ;)
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