Lecture 1 — Intro to Crypto and Cryptocurrencies

First lecture of the Bitcoin and cryptocurrency technologies online course. Course website: https://piazza.com/princeton/spring2015/btctech/home For the full experience, sign up via the link on that page. If you just want the lectures, simply subscribe to this channel. In this lecture (click the time to jump to the section): * Cryptographic hash functions 1:51 * Hash pointers and data structures 20:28 * Digital signatures 29:25 * Public keys as identities 39:04 * A simple cryptocurrency 44:39

Comments

1. at 7:16 he says "that if we know X and Y have the same hash, then it's safe to assume that X and Y are different"
   
   Did he mean to say that they are the same?
   
   The formula above shows "If we know H(x)=H(y), it's safe to assume that x=y"
2. Slide Commitment API: What's the purpose of the key? The only thing you publish at beginning is commitment. Message is kept secret until opening envelope. So you can easily do only com=h(msg) and publish com. Nobody can reveal msg from com. Message originator can't forge original message because he can't find msg' with the same hash h(msg)=h(msg'). Everything works without the key as well. All you need is clear hash.
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4. I know it starts off slow, but it has a ton of great info if you can sit through the lecture.
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   Reminds me of an MIT course.
   
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6. Good stuff, much appreciated!
7. I'm sorry but I left after X= Y .
8. Slide: Commitment API. The line commit(msg) := (H(key|msg), H(key)) probably needs to read commit(msg) := (H(key|msg), key).
9. Excellent! thank you very much for sharing your knowledge
10. Excellent intro for programmers. I am sharing this with those involved in our project.
11. He looks like Tim Cook.
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13. "Intro" lol
14. What's the song used in these videos?
15. 13:45 So commit(msg) returns (com, key), where in reality this is equal to (H(key|msg), H(key)). Does this mean that the key which is to be published is actually equal to H(key)? In that case, how could it possibly be that the verification method which uses the published key(aka H(key)) could ever succeed, since it will always be doing: verify(com, H(key), msg):=H(H(key)|msg)==com bearing in mind that com=H(key|msg).
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19. great lecture very well explained thanks.....
20. 16:08 "Let me just go through it "Bit-by-bit"" lol