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Digital ElectronicsError Detection Codes

In modulo-2 polynomial division used for CRC generation, subtraction is performed using?

  • AXOR without borrow
  • BOrdinary decimal subtraction with borrow
  • CXNOR with carry
  • DTwo's-complement multiplication
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Correct Answer: A. XOR without borrow
Explanation: Over GF(2), addition and subtraction are identical and correspond to XOR; there are no carries or borrows.
Reference: Standard digital electronics: CRC modulo-2 arithmetic
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