ZKP8.2 FRI (Univariate) Polynomial Commitment

ZKP学习笔记

ZK-Learning MOOC课程笔记

Lecture 8: FRI-based Polynomial Commitments and Fiat-Shamir (Justin Thaler)

8.2 FRI (Univariate) Polynomial Commitment

• Recall: Univariate Polynomial Commitments
  

• Initial Attempt from Lecture 4 (Merkle Tree)
  

• Fixing the first problem (Want P time linear in degree, not field size)
  

• Biger blowup factor -> more prover time, less verifier time, shorter proofs
• The key subset: roots of unity
  

• Example
  

• Fixing the second problem

  • Merkle tree does not tell you any structure of the vertor at all
    

  • The (interactive) low-degree test: Folding Phase
    

    • Example
      

  • The (interactive) low-degree test: Query Phase
    

• Back to the folding phase: more details

  • The (interactive) low-degree test: Folding Phase
    

• Example
  

• The (interactive) low-degree test: Folding Phase
  

• Compare to Lecture 7