Comments by "Lawrence D’Oliveiro" (@lawrencedoliveiro9104) on "SHA: Secure Hashing Algorithm - Computerphile" video.

  1. 1:34 Well, by “completely changed” you mean that somewhere around 50% of the bits in the hash flip to different values. You don’t want them all to flip (or flip according to any discernible pattern), otherwise that’s no longer quite so random.
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  2. 3:17 And the reasons why the NSA came out with SHA-1 to replace the earlier SHA-0 (or just plain “SHA”) were not revealed publicly. But the weaknesses in the original SHA were discovered independently a few years later. This was part of a sequence of evidence indicating that the gap between public, unclassified crypto technology and what the NSA has was narrowing, and may not be significant any more.
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  3. Apple once tried to get away with MD4.
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