Anubis.
lock.cmpxchg8b.com

Some thoughts on how useful Anubis really is. Combined with comments I read elsewhere about scrapers starting to solve the challenges, I’m afraid Anubis will be outdated soon and we need something else.

  • Guillaume Rossolini@infosec.exchange
    0·
    14 days ago

    @mfed1122 @tofu any client-side tech to avoid (some of the) bots is bound to, as its popularity grows, be either circumvented by the bot’s developers or the model behind the bot will have picked up enough to solve it

    I don’t see how any of these are going to do better than a short term patch

    • rtxn@lemmy.worldEnglish
      0·
      14 days ago

      That’s the great thing about Anubis: it’s not client-side. Not entirely anyways. Similar to public key encryption schemes, it exploits the computational complexity of certain functions to solve the challenge. It can’t just say “solved, let me through” because the client has to calculate a number, based on the parameters of the challenge, that fits certain mathematical criteria, and then present it to the server. That’s the “proof of work” component.

      A challenge could be something like “find the two prime factors of the semiprime 1522605027922533360535618378132637429718068114961380688657908494580122963258952897654000350692006139”. This number is known as RSA-100, it was first factorized in 1991, which took several days of CPU time, but checking the result is trivial since it’s just integer multiplication. A similar semiprime of 260 decimal digits still hasn’t been factorized to this day. You can’t get around mathematics, no matter how advanced your AI model is.

        • Passerby6497@lemmy.worldEnglish
          0·
          14 days ago

          Please, explain to us how you expect to spoof a math problem that you have to provide an answer to the server before proceeding.

          You can math all you want on the client, but the server isn’t going to give you shit until you provide the right answer.

            • Passerby6497@lemmy.worldEnglish
              0·
              14 days ago

              You’re given the challenge to solve by the server, yes. But just because the challenge is provided to you, that doesn’t mean you can fake your way through it.

              You still have to calculate the answer before you can get any farther. You can’t bullshit/spoof your way through the math problem to bypass it, because your correct answer is required to proceed.

              There is no way around this, is there?

              Unless the server gives you a well-known problem you have the answer to/is easily calculated, or you find a vulnerability in something like Anubis to make it accept a wrong answer, not really. You’re stuck at the interstitial page with a math prompt until you solve it.

              Unless I’m misunderstanding your position, I’m not sure what the disconnect is. The original question was about spoofing the challenge client side, but you can’t really spoof the answer to a complicated math problem unless there’s an issue with the server side validation.