A Crypto Challenge For The Telegram Developers

Re:A Crypto Challenge For The Telegram Developers by paveldurov on Thursday December 19, 2013 @07:19PM (#6938987)

As mentioned at http://core.telegram.org/contestfaq if more tools to interact with the traffic are needed for the contestants to crack Telegram, they will be provided in the next contest right after 1 March, 2014. The current contest has an important practical task of deciphering traffic that is being intercepted in real time. This is the basic concern of regular users like myself (me and lots of other people in Russia had to stop using WhatsApp because of easily decipherable intercepted traffic). If Telegram proves to be robust in this respect, more tools to manipulate traffic and wider contests with similar prizes are to follow. Like all startups, this contest by Telegram starts from solving a basic but most important problem, then gradually gets more complicated in functionality and scope.

Telegram will always be interested in creating incentives for the crypto-community to check its security and provide feedback. So if you are waiting for tools to try, e.g., a MITM on Telegram and get your $200К, please stay tuned. It's @telegram on Twitter.

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Re:A Crypto Challenge For The Telegram Developers by zooko_LeastAuth on Thursday December 19, 2013 @09:44PM (#6939595)

Thanks for sponsoring the Telegram product. (Even though I think what they are trying to do could be done much better.)

Could you please ask the Telegram team to post the exact contents of the first message that Paul sent to Nick, except with the secret email address X'ed out? I explained in https://news.ycombinator.com/item?id=6937631 that if the MT protocol is secure, then there is no risk in posting such a "known plaintext", so the Telegram team should have no problem posting it.

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Re:A Crypto Challenge For The Telegram Developers by moxie on Thursday December 19, 2013 @08:22PM (#6939290)

Does this mean that you were unable to recover Alice's message?

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Re:A Crypto Challenge For The Telegram Developers by paveldurov on Thursday December 19, 2013 @09:06PM (#6939461)

Alas, I am not a cryptographer and not even a member of the Telegram team. I'm just a guy who backs Telegram financially and proposed to start their contest. I described my motives behind it here https://news.ycombinator.com/item?id=6938622

As for your contest, I will make sure the Telegram team will have a look at it once they are awake. As far as I understand, you designed it to be similar to Telegram's contest. How do you send messages that affect traffic in real-time? How large is the prize? Is there a deadline?

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Re:A Crypto Challenge For The Telegram Developers by ash on Friday December 20, 2013 @06:03AM (#6940866)

Have you taken part in Telegram contest design?

> How large is the prize?

I think the "prize" is obvious. Breaking this "unbreakable" 896bit-RSA + no auth + no signature + MD2 + XOR is a necessary condition for the Telegram contest to be taken seriously.

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Re:A Crypto Challenge For The Telegram Developers by anonymoushn on Thursday December 19, 2013 @11:36PM (#6939967)

You can generate your own messages according to the scheme he gave (even using the same public key from Bob if you like), but they will not be aggregated into a public log.

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