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Current status - as of December 2018 - of known attacks:
get a file to get another file's hash or a given hash: impossible
get 2 different files with the same MD5: instant
make 2 arbitrary files get the same MD5: a few hours (72 hours.core)
make 2 arbitrary files of specific file formats (PNG, JPG, PE...) get the same MD5: instant
get two different files with the same SHA1: 6500 years.core