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  • Hacker News
  • Good to hear .nice work
    by abisheakp197
  • nice poem at the end of the paper
    by benmmurphy
  • Actually it does apply to some padding schemes but old ones those based on the adding of a fixed pattern of bits.
    by Galois12345
  • I was unaware of snfs algorithms for generic moduli and/or signatures. Very nice. The theoretical result is purely due to the 2007 Joux et al. paper. What’s new is the implementation and the 1024-bit rsa signature forgery.

    Also no ai, so we can expect some speedups soon.

    I really didn’t expect rsa to be targeted so much this year. Hope that these results will motivate people to pursue algorithmic improvements!

    by nk_kolja
  • I was expecting to see mention of Microsoft/Apple executable code-signing in the examples. I know key lengths are well beyond 1024 now, but on the Microsoft side it was (is?) possible for USB tokens to be distributed in the mail. What I don't know is whether the tokens could be used as oracles in this attack.
    by RossBencina
  • "It does, however, drastically lower the estimated security of RSA, and it does so in a way no one knew of previously"

    Wrong.

    Multiplicative structure of RSA is known since it was invented, and that's exactly why standard like PKCS were created. This attack is NOT applicable to these standards (as said in the article). Author shows a poor understanding of the field.

    Using RSA blinding signatures is like using windows 95 and connect it directly to the internet.

    by xeyownt
  • in the PDF metadata we find the proper and appropriate title of this work:

        Nearly SNFS-Speed Signature Forgery Sans Factoring N (NSNFSSSFSFN)
    by yababa_y
  • The most important thing to know about this work, which is awesome, is that it relies on access to a raw RSA oracle, where you have a public key and an API that allows you to directly do RSA operations with the corresponding key. The idea is that you then lose access to the oracle, and thus to the private key, but you've gained enough information from your session with the oracle to make forgeries in the future.

    So it's not a straightforward general-purpose RSA-1024 signature break; it's pretty situational. The paper goes into detail (in section 5) about how those situations can emerge in practical scenarios.

    by tptacek

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