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Article #12345 on this BBS, which has checksum d3b07384d113edec49eaa6238ad5ff00, was really posted by me!
It's really important that it be difficult to generate a message with a given checksum
Otherwise, the BBS operator could make up a new message with the same checksum
And replace my real message with the new message
I AM GAY! HEHEHEHEHE! e5e8545a2466261c5c6fe5624f269b02 I AM GAY! HEHEHEHEHE!! d32ec4e015eefec542b451d73a4b8b65 I AM GAY! HEHEHEHEHE!!! 9add7cfaebabda56e73fc17034ec25bd I AM GAY!! HEHE!!! 5e9befc4cfdbcbc762448970a41dade8 I AM GAY!! HEHEHEHEHE!!! 99248cce20982c5d054671a4bbb68cf9 I AM GAY!! HEHEHEHEHE! db52be257b750d581059be2e199f46de I AM GAY!! HEHEHEHEHE!! f243bd117dec0fbaf0b107f2f32520ea I AM GAY!! HEHEHEHEHE!!! 6a9aa81f6e0e87e83f86eaa1430c5b05 I AM GAY!!! HEHEHEHEHE!!! 357e6b7c31158f9fc355a96066117fb8 I AM GAY!!! HEHEHE!!! d3b07384d113edec49eaa6238ad5ff00 I AM GAY!!! HEHEHEHEHE! 34943e3c88b7966a69706be8ba6830e8 I AM GAY!!! HEHEHEHEHE!! fa40b295047bf9a00f7c7b35ac1778c8 I AM GAY!!!! HEHEHEHEHE!!! 3cdf061797a00ab6f7042983067c0b8b I AM GAY!!!! HEHEHEHEHE! 0bb2b136fb1d03bd85bd578e83cfd6e3 I AM GAY!!!! HEHEHEHEHE!! 3a4b9f8c7853681f9161aab564f1ecf5 I AM GAY!!!! HEHEHEHEHE!!! 9e779160a8ebb249eab4fdb079ad8b93 I AM GAY!!!!! HEHEHEHEHE!! d82d25b94cd01889e5efdc1f2ed73ba3 ...
As a special case, this also means it's hard to discover the original data that was checksummed
How to guarantee that it's hard to find a message with a given checksum?
But we do have some methods that seem to work OK in practice
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