While these are considered to be insecure (that is, it has been shown that it is possible to generate two different files with the same hash), they are still commonly used for file verification. Other algorithms include SHA1, MD5, and CRC32. Many such algorithms exist – currently, the ones recommended to be used are SHA-256 and SHA3. A hash is generated through a special algorithm designed to produce a unique result for any file – producing vastly different results if even the tiniest change is made to the file. They are used to quickly verify that the file you received is the file you were expecting, down to the last bit. These strings are called file hashes or checksums.
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