Comments by "Lawrence D’Oliveiro" (@lawrencedoliveiro9104) on "One Encryption Standard to Rule Them All! - Computerphile" video.

  1. 1:33 Two keys, not three for triple DES. That’s what it says in Tanenbaum’s Computer Networks text, 4th ed, page 740. You encrypt with key K₁, decrypt(!) with K₂, then encrypt again with K₁.
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  2. In his honour, instead of #hashtags in future, let us have £poundtags.
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  3.  @timothycurnock9162  How does the key know the difference between a “hack” and a “legitimate decrypt”?
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  4.  @timothycurnock9162  How does the key know who it has been given to?
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  5. All computers are already “quantum” computers. Transistors (and vacuum tubes before them) would not work without quantum effects.
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  6.  @jasonschuler2256  Looks like some people don’t understand what “quantum” means. It’s not a marketing term, you know.
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  7.  @JNCressey  You mean like how a charge carrier in a transistor can be in a superposition of states on both sides of the gate? Which is how it can pass through the energy barrier and carry a (classically-impossible) current?
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  8.  @JNCressey  Except that the data doesn’t actually exist in superposition. That’s why “quantum” computers have such a high noise level, making them unusable for digital computations.
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  9.  @stromboli183  Cracking encryption will require fast number-theoretic computations. Which “quantum” computers have proved incapable of.
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