PoW Based Distributed Cryptography with No Trusted Setup

PoW Based Distributed Cryptography with No Trusted Setup

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Bitcoin main design principle

2 of 19

2 of 19

Bitcoin main design principle

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PoW Based Distributed Cryptography with No Trusted Setup

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  1. 1 Intro
  2. 2 Bitcoin main design principle
  3. 3 Difference from the MPC literature
  4. 4 If "majority" is defined in terms of computing power
  5. 5 How is the computing power verified? Proofs of Work (Pows)
  6. 6 Proofs of Work - security
  7. 7 Bitcoin's implementation of the bulletin board
  8. 8 Problems with Bitcoin's solution
  9. 9 Satoshi's solution
  10. 10 Natural idea: start from scratch
  11. 11 Motivation
  12. 12 What is the "Bitcoin network model"?
  13. 13 Modeling computing power
  14. 14 Summary of our results (2/2)
  15. 15 Main tool: a "PoW-based secure broadcast protocol"
  16. 16 The adversary can send a bounded number of messages We assume that several parties can broadcast their messages at the same time.
  17. 17 Observation Proofs of Work make sense only when the challenge is not known in advance. Consider the following protocol
  18. 18 Idea: let every party Pi broadcast her challenger
  19. 19 A problem with this solution What if the adversary ignores r; of some honest party?

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