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· 5 min read
Rahul Saxena

Let us see today when and why do we use abi.encode vs abi.encodePacked.

What is a hash function?

A hash function has the following characterisitics:

  • A function that takes in arbitrary size input and outputs a data of fixed size
  • Properties:
    • Deterministic
      • hash(x) = h, every time without fail
    • quick to compute the hash
    • irreversible
      • given h, (really)hard to find x such that hash(x) = h
    • small change in input changes the output significantly
      • hard to find x, y such that hash(x) = hash(y)