Hashing, Hashing Algorithms, and Collisions - Cryptography - Practical TLS

Hashing, or a Hashing Algorithm takes "something" (a message, a file, a certificate, computer code, anything) and turns into a smaller, representational sample of the original something. The result of a hashing algorithm is known as a Digest (among other names).

To check if two files are perfectly identical, you can simply run them both through a hashing algorithm and compare the digests. If the digests are the same, then you know both files are also identical. In the rare cases that multiple files result in the same digest... you have what's known as a Collision. And while rare, collisions are unavoidable.

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00:00 - Hashing Algorithms - Definition & Simple Explanation
01:42 - Real World Hashing requirements
04:20 - Hashing Demonstration with Linux - md5sum
07:48 - Hash Collisions - Unfortunately, they can't be avoided
10:18 - Hashing Algorithms: md5 sha sha1 sha2 sha224 sha256 sha384 sha512

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[xrZt]

Just a small note, by piping the output of echo command to md5sum you also take a new-line character (hex value 0A) into account to produce the MD5 digest.
Use -n flag with echo command to omit the new line and you'll get the pure MD5 hash of the string "hello", or you can just use "printf" command in stead of "echo".

P.S.
Love your content, please keep up the great work you're doing for the community.

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This was immensely helpful visualizing the way the algorithms work, their limitations, and described the components that make one up. Great work! I'm excited to check out your other stuff!

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