Hard Live

Defying Hell

100 points

24 Solves

Cryptography

Hard

Noxtal

Community Rating: 5.00 / 5

Alice has been sharing secret encrypted messages with Bob. I would really like to know what those are...

I contacted my good friend Eve, a well-known eavesdropper. She sent me the numbers she found at the beginning of their conversation. By the look of things, this looks like a key exchange. If we would find the key, we would be able to decode every message they encrypted with it!

Help me find both private keys. To submit the flag, decode them correctly and wrap them into CTFlearn{<Alice>_<Bob>} format.

Hint: the title of this challenge is a pun... I can't tell you more ;)

First 10 Solvers

Rank Username
1 Noxtal
2 ebouteillon
3 Caillou
4 shikame
5 tenchijin
Rank Username
6 0utWrest
7 SketchyDuck
8 mildsunrise
9 voyante
10 usuki123

  • ebouteillon

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    • Caillou

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      • Noxtal

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      • 0utWrest

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        • Noxtal

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          • Noxtal

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      • 0utWrest

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        • Noxtal

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    • Noxtal

      Absolutely! This challenge has not been designed for that. It is mostly about research: you need to search quite a bit to find good algorithms to solve this challenge. I suggest you check out the Wikipedia page of this key exchange algorithm. :)

      • SketchyDuck

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          • Noxtal

            Glad to hear that, thanks a lot!

  • mildsunrise

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  • voyante

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    • voyante

      ok :) solved forgot that there can be last step!

      • Noxtal

        Glad to hear that, congrats! Thanks for trying my challenge! :)

  • Veritas

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    • Noxtal

      Try converting the keys to something human-readable ;) Hope it helps :)

  • Lriend

    Thanks for this challenge. Amazing one <3

    • Noxtal

      Glad to hear that! Thanks!! <3