Weaknesses
The Fletcher checksum cannot distinguish between blocks of all 0 bits and blocks of all 1 bits. For example, if a 16-bit block in the data word changes from 0x0000 to 0xFFFF, the Fletcher-32 checksum remains the same. This also means a sequence of all 00 bytes has the same checksum as a sequence (of the same size) of all FF bytes.
Read more about this topic: Fletcher's Checksum
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“Once we know our weaknesses they cease to do us any harm.”
—G.C. (Georg Christoph)
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—Mary Barnett Gilson (1877–?)
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—Philip Dormer Stanhope, 4th Earl Chesterfield (1694–1773)