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2.1 - Public Key Cryptography Assignment.md

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2.1 - Public Key Cryptography

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Assignment - 1

What is the 11001010 converted to a decimals ?

Answer
  • 2^7: 1×27=1×128=128
  • 2^6: 1×26=1×64=64
  • 2^5: 0×25=0×32=0
  • 2^4: 0×24=0×16=0
  • 2^3: 1×23=1×8=8
  • 2^2: 0×22=0×4=0
  • 2^1: 1×21=1×2=2
  • 2^0: 0×20=0×1=0
    • = 202

Assignment - 2

What do you think happens to the first element here? Does it throw an error?

let uint8Arr = new Uint8Array([0, 255, 127, 128]);
uint8Arr[1] = 300;

Assignment - 3

Adding support for ETH

Given we just derived a few public keys in SOL, can you try doing the same for ETH? Again for reference, this is how backpack does it - https://github.com/coral-xyz/backpack/blob/master/packages/secure-background/src/services/evm/util.ts#L3

Assignment - 4

Creating a web based wallet

Create a simple web based wallet where someone can come and create a pneumonic, add multiple wallets and see the public key associated with each wallet