Step1b: Split the permuted key

• Two halves: C0 and D0

  • Each is 28 bits

• Example:

  K+ = 1111000 0110011 0010101 0101111 0101010 1011001 1001111 0001111
  
  C0 = 1111000 0110011 0010101 0101111
  D0 = 0101010 1011001 1001111 0001111

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