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.
This lesson is a free sample lesson from the the most effective TLS and SSL training course ever created. No instructor rambling on about pointless stories. No slides with massive walls of text. No time wasting. Only simple, effective, and precise explanations. Complimented with practical illustrations and visuals.
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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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• Networking Fundamentals
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[@PracticalNetworking]

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[@dwaynesinclair2155]

No words can do justice to the clarity of your explanations. It is simply amazing. Thank you Sir.

[@PracticalNetworking]

Thank you for the kind words, Dwayne. You're very welcome.

[@ManhwaRecapMaster]

I have learned more from you than any of my classes. Please keep making contents. you were born to teach. Very very talented!

[@PracticalNetworking]

Thank you for the kind words, Mingmar. Glad you enjoyed this content.

[@karanvyas5155]

I have learned more from you than any of my expensive classes. Please keep making contents. you were born to teach Sir. Very very talented!

[@PracticalNetworking]

Glad you're enjoying my content, Karan. =) Could you do me a favor? Do you mind sharing this video on Linked In, Reddit, Facebook, or any other social media you use? As an independent creator, that would be an _enormous_ help, and I would appreciate it _greatly_ .

[@Davidc10]

This is the first video I've seen of this channel but I have a feeling I will soon feel the same way.

[@diptiranjansahoo5278]

I love the way you teach us. Please continue the rest part of TCP.

[@jephthahefereyan7431]

I have taken many online courses (both free and paid) but I can confidently say that this is by far the most thorough yet simple. I am not a network professional, just a programmer. But your explanation of these concepts has been very clear to me. It's not hard to see your passion for your craft. I think anyone whose job has something even slightly to do with this should definitely take the full course. You are a genius of a teacher.

[@Nicrophelia]

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!

[@adedejiemmanuel1]

You are a blessing to this generation, honestly.!!!

[@cssssp2192]

indeed!

[@VictoriaOtunsha]

You guys make the best videos on this app, simplifying complex topics within minutes. Thank you!

[@PracticalNetworking]

You're welcome again, Ogiri. Glad you are enjoying this.

[@rahmalh]

Explained in very easy manner. Appreciate your efforts.

[@x0rZ15t]

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.

[@pyaephyothaw10107]

You videos are too simple to got the point for me sir. Thanks alot.

[@user-gu5lu6rs8x]

Thank you for this series!!!

[@DerrickAwayevoo]

simple and clear teaching. thanks will always come here

[@PracticalNetworking]

Thank you, Jenny, glad you enjoyed it.

[@thatman2132]

I have watched and studied your Networking Fundamentals series guide and found it very clear and comprehensive

[@PracticalNetworking]

Thank you =). Glad you enjoyed it!

[@universalponcho]

Brilliantly articulated. Thank you very much kind sir for your positive input into the universe.

[@PracticalNetworking]

Thanks for the kind note, Jamey. Glad you enjoyed it =)

[@jervyqe]

Thank you sir for the deep dive lessons, I am motivated to learn more through your courses.😁

[@vilasrao8664]

Excellent and really useful. Thank You for putting together wonderful videos.

[@PracticalNetworking]

You're welcome!

[@stundogha4947]

Great work

[@rafaelhenriquemachado3367]

SSL and TLS course? Awesome!

[@PracticalNetworking]

Indeed =)

[@geyvandova]

Excellent tutorials, thank you!

[@PracticalNetworking]

You're welcome

[@JoeBlac]

Another well-explained lesson. Thanks.

[@PracticalNetworking]

Thank you, Joe. You're welcome =)

[@Tendo_27]

Thank you so much for this video, learnt alot from this 🙏🏼🙌🏼❤️🌸

[@armandocastro3841]

This was an amazing explanation.

[@PracticalNetworking]

You're very welcome =)

[@arishkhan8325]

Thanks for uploading video

[@piratevv]

I have been waiting for this since the announcement for the TLS series.. the first comment :)

[@PracticalNetworking]

Congratulations Vigneshwar! You won one of the free course giveaways. Reach out to me on Discord to claim your prize =) pracnet.net/discord

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Self-teaching myself through these🖤

[@PracticalNetworking]

Congratulations Aya! You won one of the free course giveaways. Reach out to me on Discord to claim your prize =) pracnet.net/discord

[@tund3_]

The simplicity is unreal, thanks a lot, it feels weird to be getting this for free, a lot of paid courses do not explain things clearly and simply like this. Thank you. Do you have any course on Udemy?

[@PracticalNetworking]

I have some courses on Udemy, but most of that content is available on KZbin, specially with a membership to my channel. Alternatively, I have courses on my own platform: classes.pracnet.net. But reach out to me on Discord and I'll hook you up with discounts. =)

[@realnanact]

Thanks so much , very good tutorial

[@PracticalNetworking]

Thank you, Daniel!

[@Atom-Mercury]

Thanks for this video.

[@PracticalNetworking]

Glad you enjoyed a lot of this content, Zino. You're very welcome. CHeers !

[@Don-Carillo]

Cheers. Nailed it 👌 👏

[@PracticalNetworking]

Thanks Don, glad you enjoyed it =)

[@IliyaDamyanov]

Very good video.

[@freeEgyptian]

Thanks

[@nnarkozz_music]

Thank you!

[@PracticalNetworking]

You're welcome! =)

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I am one of the first to be here. I have been monitoring since 2 am. This is a great video as you represent.

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Best tutorial. Could you just make a video on explain the difference between ssh & ipsec with packet exchange? And why ssh is not used for site to site vpn

[@thefutureforme9765]

Perfect

[@surendras5853]

Thanks a ton

[@PracticalNetworking]

You're welcome!

[@frempongadarkwa2232]

Powerful

[@maxmaster9908]

thanks!

[@AkumaNoKuma]

thanks

[@Chosen_1k]

I used to know how to do all this👁️. Getting my game back for personal reasons hehe🤗

[@PracticalNetworking]

You can do it!

[@ayradizem2770]

Thank you

[@PracticalNetworking]

You're welcome!

[@syscopio3452]

Great tutorial Ed. Which made me want to checkout your full course. but I was a bit disappointed seeing the price 297 USD. I am not saying your course is not worth such a high price, but such a high price does make it less accessible to the common public. Maybe lowering the price Or selling it on udemy would increase your sales exponentially ? Anyways thanks for this free video. Cheers.

[@PracticalNetworking]

Glad you enjoyed this video. There is a discount code in the pinned comment that will make the course more affordable =)

[@iliandrei1408]

Had you consider to make some videos anout Wireshark?

[@PracticalNetworking]

Yes. One day. It would be great fun =)

[@RealityCheck6969]

This video was exactly for my noob ass. Thanks!

[@catmando1786]

So let me check this. If I send you a message and the hash reads 11111 and you know which algorithm I used then you can decipher my message in reverse, yeah? But what about collisions? In theory my message could be the other message that also contains 11111.

[@PracticalNetworking]

11111 is only a 5-bit hash (5 digits, 1 or 0 each digit). That means there are only 64 possible hash digests. Which means there will be A LOT of collisions. All the modern hashing algorithms use much, much higher bit length. MD5 (often considered the least secure hashing algorithm) is 128 bits. I unpack collisions in more detail starting from 07:50 onwards.

[@vishalreddy9566]

is it possible for you to make one big project in practical explaination in one vedio Full CCNA? 1.saparete DHCP server 2.saparte DNS server/ couple of websites to be included 10 3.using different connecting media/ voice over ip 4.how https,FTP, Smtp Etc.. work on 7th layer with respect to TCP 5.Routing of in OSPF , RIP2, Eigrp, redistribution in real time 6. NAT and ARP and layer2&3 switch 7. variable length subnet mask if needed 8.CSMA/CSMD in switch and frame check sequence 9.packet travelling in real time using encapsulation using mesh topology. thank you

[@PracticalNetworking]

Ooph, that would be one very long video =). A lot on that list I've already covered elsewhere. I posted all my CCNA related content here: www.practicalnetworking.net/index/ccna/

[@vishalreddy9566]

@@PracticalNetworking yeah me too out of my senses asking like that 😀 . Funny

[@khongmunhing6948]

SHould be the digest should be 7 and original message is 8. It is because it produce the same digest result.

[@PracticalNetworking]

I'm not sure I understand your question.

[@khongmunhing6948]

@@PracticalNetworking it is my bad. you can ignore it. After i have watching it again. Thanks.

[@PracticalNetworking]

@@khongmunhing6948 No worries. You're welcome =)

[@nizziness]

Teachers like you should be famous.. instead of tiktokers and influencers 😢

[@PracticalNetworking]

[@farhadplace]

:)))))))))))))))

[@PracticalNetworking]

:)

[@datvuong7420]

are first two requirements the same??

[@addie8171]

Thank you !

[@PracticalNetworking]

Welcome!