Decryption

• Decryption

  • Decryption is done by reversing the encryption steps (every step is inversible in the encryption)
  • The order of the steps is (generally speaking) reversed
  • the individual steps are replaced by their inverses.
    Examples:
    
    s0 += s1 is reversed to s0 -= s1
    s0 ^= s1 is self-inverse.
    Some special cases need to be taken care of.

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