Step 3c: XOR with the key

• XOR E(Rn–1) with Kn

• Example

  K1 = 000110 110000 001011 101111 111111 000111 000001 110010
  
  E(R0) = 011110 100001 010101 010101 011110 100001 010101 010101
  K1 ? E(R0) = 011000 010001 011110 111010 100001 100110 010100 100111

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