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github.com/moarvm/moarvm | IRC logs at colabti.org/irclogger/irclogger_logs/moarvm Set by AlexDaniel on 12 June 2018. |
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| samcv | so i did some work over a few days. and i wasn't able to do a meet in the middle attack on our current hash implementation. due to how it has three state variables rather than just 1 in most hashing systems | 04:06 | |
| the space of three uint32's is too great to be able to attack it easily this way it appears to me | 04:08 | ||
| i may still switch to siphash since it's been studied more though, but the need isn't very pressing | |||
| and i think they're about the same speed as each other in the testing i had previously done | 04:10 | ||
| though i may be able to speed up what we're doing now a bit | 04:11 | ||
| and i would like a 64 bit hash value | 04:17 | ||
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| samcv | I got this with asan gist.github.com/samcv/4d12bb5e80a6...4dd6efb541 | 05:55 | |
| in t/concurrency/01-thread.t. it's a flapper | 05:56 | ||
| actually it only happened once :\ | 06:03 | ||
| even though i tried runnig it in a loop | |||
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| lizmat | do we have a writeup on MoarVM's garbage collection somewhere I can refer to in an article? | 10:05 | |
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| japhb | samcv: www.schneier.com/blog/archives/201...s_law.html seems relevant. :-) | 15:10 | |
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| samcv | japhb: yep very true. switching seems good just because i haven't found any security research on it. though it doesn't appear Meet in the middle vulnerable. there may be other ways to exploit it :P | 17:47 | |
| or it is, though i fairly suspect it's not given it has three but not two state variables | 17:48 | ||
| since you need all three 32 bit uints to match up to do it properly. just not likely enough to make it feasible and i think slower than a brute force attack | 17:49 | ||
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| samcv | siphash is slower though | 19:28 | |
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