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jalyst is offline jalyst
2011-07-30 , 06:49
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#2951
Originally Posted by PortaDiFerro View Post
Saw some lady taking pictures of her kids with N9 at an amusement park (Särkänniemi) today. Felt so jealous and was tempted to ask her if I could try it out..
What, how is that possible?
Nokia employee?
 

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Mandibela is offline Mandibela
2011-07-30 , 07:36
Posts: 270 | Thanked: 195 times | Joined on Aug 2009 @ Finland
#2952
Originally Posted by jalyst View Post
What, how is that possible?
I've seen two in the wild, and I don't go out very much =D
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jalyst is offline jalyst
2011-07-30 , 07:43
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#2953
They're everywhere people, it's official!
 

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momcilo is offline momcilo
2011-07-30 , 07:47
Posts: 673 | Thanked: 856 times | Joined on Mar 2006
#2954
Originally Posted by jurop88 View Post
Really disappointed on this ElGamal N9


Go figure I started coding a Python script to find a prime for which 10 was a 'prime root' (but didn't finish it due to lack of time and coding skills hahaha)

Only precisation, Alice would refuse the message as not true because public key is not valid - anybody tried to check if the verify works? Since the 'prime root' condition is not satisfied, it shouldn't...
You should have used Wai Dei's crypto++ library, which has all necessary primitives and the reference el-gamal itself.

I've re-implemented the el-gamal to target this specific code (I was more interested in integer values than in encoded forms of the cipher text). In fact I verified that Alice is able to decrypt messages, something Nokia never bothered to do.

Knowledge has disadvantages.

I was able to generate large number of primes and test with numerous versions of k, and public key for Alice. M was off course 15. I've kept looking for the cipher text that fits 6 characters length. Now I know why everything failed.

Nokia has probably used the web el-gamal calculator, which allows manual entry of Alice's public key. This has actually broken the whole crypto system. In fact what they've invented is not a crypto system at all.

If they really wanted to be cryptic they should have used hash(Snapit) + El-Gamal signature scheme.


When solution appeared, I've reentered values, and got 289 for the public key, which did not make sense. Than I've decided to replace public key with 255, and got the "correct" result.

Congratulations to guy who figured out this.

In any case don't use NFC capability as your wallet (it is based on cryptography), since these guys don't understand cryptographic algorithms.

So let's see what is the last code.
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Last edited by momcilo; 2011-07-30 at 08:05.
 

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danramos is offline danramos
2011-07-30 , 07:54
Posts: 4,672 | Thanked: 5,455 times | Joined on Jul 2008 @ Springfield, MA, USA
#2955
Originally Posted by jalyst View Post
They're everywhere people, it's official!
IT'S FINALLY HERE! Everybody go out and buy one NOW!
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momcilo is offline momcilo
2011-07-30 , 07:56
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#2956
Originally Posted by danramos View Post
IT'S FINALLY HERE! Everybody go out and buy one NOW!
Ha Ha Ha Ha (I just had to use less compact form to fit 10 characters limitation)
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HtheB is offline HtheB
2011-07-30 , 08:04
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#2957
So where is the last clue?
Edit: D'oh! It will be on monday in the morning again
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aikipy is offline aikipy
2011-07-30 , 08:48
Posts: 30 | Thanked: 14 times | Joined on Mar 2011 @ Romania
#2958
Besides the fact that the public key couldn't be 255, they also got the p wrong! It certainly can't be 307, considering the fact that g must be it's prime root and that it has to satisfy p = 2^k * q + 1, where q must be a prime... The first prime number, greater than 304, that satisfies both those conditions is 383. I'm kinda disappointed
 

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abill_uk is offline abill_uk
2011-07-30 , 08:55
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#2959
Originally Posted by jalyst View Post
I meant what I said, but prolly not what you think I meant, if you know what I mean.
CBF'd explaining in further detail...
I knew what you meant haha just some cannot understand English
 
abill_uk is offline abill_uk
2011-07-30 , 08:58
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#2960
Originally Posted by momcilo View Post
Ha Ha Ha Ha (I just had to use less compact form to fit 10 characters limitation)
He's a complete headcase is our danramos hahaha go call him a doctor quick
 
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