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solardiz's profile
Solar Designer
Solar Designer
Solar Designer
@solardiz

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Solar Designer

@solardiz

@Openwall founder. RTs don't imply agreement with points of view.

openwall.com
Joined August 2012

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    1. Jeremi M Gosney‏ @jmgosney Aug 14
      Replying to @jmgosney @jwcreation

      Second, FPGA is essentially worthless for anything outside of very slow hashes with external candidate generation & comparison, or single hash brute force against fast hashes. For anything else, you need to add RAM. 4/n

      1 reply 0 retweets 1 like
    2. Jeremi M Gosney‏ @jmgosney Aug 14
      Replying to @jmgosney @jwcreation

      Adding a sufficient amount of RAM to an FPGA that is fast enough to facilitate anything other than single hash brute force is incredibly expensive. There are FPGA boards with DDR3 or DDR4, but these aren't fast enough. 5/n

      1 reply 0 retweets 1 like
    3. Jeremi M Gosney‏ @jmgosney Aug 14
      Replying to @jmgosney @jwcreation

      SRAM or FRAM would be ideal, but extremely expensive in the required quantities. GDDR5 or GDDR6 is a possibility, but no one makes such a board, and developing such a board is currently out of our financial reach. 6/n

      1 reply 0 retweets 0 likes
    4. Jeremi M Gosney‏ @jmgosney Aug 14
      Replying to @jmgosney @jwcreation

      And if we did have the means to create such a board, we'd probably create something far cooler than an FPGA board, such as our own custom integer coprocessor designed specifically for accelerating hash calculations.

      1 reply 0 retweets 3 likes
    5. Jeremi M Gosney‏ @jmgosney Aug 14
      Replying to @jmgosney @jwcreation

      However, such a coprocessor would ultimately look a hell of a lot like a GPU, minus FPU and the bits necessary to push pixels, and without the benefit of being subsidized by gamers and thus would cost far more than a GPU.

      1 reply 0 retweets 3 likes
    6. Jeremi M Gosney‏ @jmgosney Aug 14
      Replying to @jmgosney @jwcreation

      Therefore, there really exists no economic incentive to develop such a coprocessor, and for the foreseeable future, nothing beats GPUs in terms of price, performance, flexibility, ease of development, etc. GPU is the "sweet spot."

      1 reply 0 retweets 2 likes
    7. Jeremi M Gosney‏ @jmgosney Aug 15
      Replying to @jmgosney @jwcreation

      Eventually I think GPGPU will be displaced by manycore CPUs, but I think we're still a ways away from that happening.

      1 reply 0 retweets 2 likes
    8. Jeremi M Gosney‏ @jmgosney Aug 15
      Replying to @jmgosney @jwcreation

      Does this answer your question? 😊

      1 reply 0 retweets 5 likes
    9. ḏ̘͊ͅa̮ͩ̓͗̌s̬͐̑ͅh̟̤̭͍͍̔̿ͭ͒́‏ @da5ch0 Aug 15
      Replying to @jmgosney @jwcreation

      does for me, at least

      1 reply 0 retweets 2 likes
    10. Solar Designer‏ @solardiz Aug 16
      Replying to @da5ch0 @jmgosney @jwcreation

      I mostly agree except on "FPGA is essentially worthless for anything outside of very slow hashes with external candidate generation & comparison, or single hash brute force against fast hashes." JtR descrypt-ztex is fast, has on-device mask mode & comparison for 2047 hashes/salt.

      1 reply 0 retweets 1 like
      Solar Designer‏ @solardiz Aug 16
      Replying to @solardiz @da5ch0 and

      The on-device mask support also works in hybrid modes (the mask can be anywhere before/after/inside of candidates generated by other cracking modes on host). We also have thoughts on Bloom filters using most of the chip's BRAMs, which should allow for a few million hashes(/salt).

      11:17 AM - 16 Aug 2018
      1 reply 0 retweets 0 likes
        1. ḏ̘͊ͅa̮ͩ̓͗̌s̬͐̑ͅh̟̤̭͍͍̔̿ͭ͒́‏ @da5ch0 Aug 16
          Replying to @solardiz @jmgosney @jwcreation

          not that it can’t be done, but it’s probably still just more cost effective to stick with the GPUs that already have decent amounts of ultra high speed RAM, is all

          0 replies 0 retweets 0 likes
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