If two files have the same MD5 sum, the files are exactly alike - which is why MD5 "fingerprints" can verify whether or not your downloaded file got corrupted in transit.

Generating checksums—cryptographic hashes such as MD5 or SHA-256 functions for files is hardly anything new and one of the most efficient means to ascertain the integrity of a file, or to check ...

If you're doing the MD5 check as part of copying the directory structure, then you can use rsync -c which will copy the files and compute/verify the MD5 hashes on the fly.

Starting in April, Oracle will treat JAR files signed with the MD5 hashing algorithm as if they were unsigned, which means modern releases of the Java Runtime Environment (JRE) will block those ...