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Tutorial: Checksum and CRC Data Integrity Techniques for ...

1 Tutorial: Checksum and CRC Data Integrity Techniques for AviationMay 9, 2012 Philip KoopmanCarnegie Mellon DriscollBrendan HallHoneywell LaboratoriesThe views and opinions expressed in this presentation are those of theauthor, and are not necessarily those of the Federal Aviation Administration,who sponsored this work under contract DTFACT-11-C-00005. This presentationdoes not contain any technical conclusions funded by this Introduction Motivation why isn t this a solved problem? Parity computations as an example Error code construction and evaluation (without scary math) Example using parity codes Checksums What s a Checksum ?

Hamming Distance 2 (HD=2); some two-bit errors are undetected. 18 Fletcher Checksum • Use two running one’s complement checksums – For fair comparison, each running sum is half width – E.g., 16-bit Fletcher Checksum is two 8-bit running sums – Initialize: A = 0; B = 0;

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