He's so fresh and tired at the same time

@agentsd3428

3 жыл бұрын

Why is this so true?

@jimmy2895

3 жыл бұрын

his upper face is tired, the area around his mouth looks young and fresh

@chromax1619

3 жыл бұрын

just like any college student

@realdragon

3 жыл бұрын

Students when they have presentation after 5 hours of sleep

@zyxwfish

3 жыл бұрын

😂

Why do I feel like I have to submit my essay to him till tomorrow?

@Entyipo

3 жыл бұрын

Because you actually have to.

@stodgycone5849

3 жыл бұрын

@@hi_is_this_clorox_bleach ?????

@Entyipo

3 жыл бұрын

@@stodgycone5849 Don't pay attention, it's just a troll.

@MoviesSlayerPoint

3 жыл бұрын

@@hi_is_this_clorox_bleach I am going to report you. And I am letting you know that. 👍

@hi_is_this_clorox_bleach

3 жыл бұрын

@@MoviesSlayerPoint I may not be the hero you deserve but the one you need

this guy seems like he hasn't slept in a month but got 12 hours last night

@TheXavir99

2 жыл бұрын

Yeah we also saw the most liked comment

@gatti3933

2 жыл бұрын

@@TheXavir99 what

@milanstevic8424

2 жыл бұрын

@@gatti3933 "He's so fresh and tired at the same time" has 3K likes

@wuffalo

2 жыл бұрын

@@milanstevic8424 how observant of you. might you like to inform me on the colour of the sky and grass as well?

@tyrone6820

2 жыл бұрын

Imagine just rewording top comments for likes. You never trust someone named Garrett. What a tool

I will always watch these videos just in case for some odd reason I immediately know the answer. Still no luck yet again.

@bhujangjadhav4631

2 жыл бұрын

Underra Ted af

@davidspasic8623

2 жыл бұрын

Lmao reletable😂

@delubiod1970

2 жыл бұрын

Me too.

@GabrielsEpicLifeofGoals

2 жыл бұрын

I think we all do XD

@M.N.Baxter

2 жыл бұрын

Lottery for math geeks

me: “hmm maybe i could be the one to solve it” me after seeing the problem: “yeah, i don’t think i want to”

@fate6535

3 жыл бұрын

exactly

@-.-_-.-_-.-_-.-_-.-_-.-_-

3 жыл бұрын

*Can

@gabe5225

3 жыл бұрын

dunning kruger effect

@user-gt8dh7qj3w

3 жыл бұрын

imagine those numbers on your bank account

@SavvySaxy

3 жыл бұрын

Ikr same

Me clicking a video that has “MATH” in its title must be the proudest moment of my life.

@komkodachi3173

3 жыл бұрын

Hahaha ong

@jockin

3 жыл бұрын

@@hellosurname4128 haha

@gicilo386

2 жыл бұрын

@@hellosurname4128 🤣🤣

@mohammedasif5877

2 жыл бұрын

And u exactly have 256 likes

@damilosky

2 жыл бұрын

LMFAO 🤣🤣😂

7 billion people on the planet and only 1.8 million of us have seen that number 😎

@vistakay

2 жыл бұрын

But have you ever seen 69420?

@jaadmaan8156

2 жыл бұрын

Some people would have seen the episode more than once and some people may have watched it with other people, the reality is we don’t know how many people have seen it 🧐🧐🧐

@lez7746

2 жыл бұрын

Holy shit man this is historical.

@FakenameStevens

2 жыл бұрын

Wait until you see a deck of cards!

@jumpmanzach9208

2 жыл бұрын

2.1 million now

Found this video on my recommendations, I have never seen such a simple and clear explanation on SHA-256 in such a short amount of time. I even learnt something new from this! Wish I found you sooner (Would have saved me a couple hours :'D), you're a blessing in disguise, thank you so much for making learning easier🙏🏻

@MatthewWeathers

3 жыл бұрын

Thank you. I appreciate hearing that.

@lorenzodiambra5210

10 ай бұрын

​@@MatthewWeathers4:41 so while people are starving some work to undermine these shits?

@Gamert80

6 ай бұрын

​@@lorenzodiambra5210have you heard of something called coherent English? You should try it sometime.

1:57 everybody Gangasta till numbers hit the "Virgintillion"

@kry0cera962

3 жыл бұрын

lmao

@simonmultiverse6349

3 жыл бұрын

"vigin" not "virgin" ... got something on your mind?

@maxsageder9395

3 жыл бұрын

@@simonmultiverse6349 someone definitely got the joke...

@gb.buenoo

3 жыл бұрын

@@simonmultiverse6349 you’re the definition of a virgin

@nightcrawler2126

3 жыл бұрын

@@simonmultiverse6349 i think it's u buddy (buzzkill alert)

“Which is worth somewhere between $12 and $12,000,000” a nice nod to the volatility of Bitcoin😂

@dexio85

3 жыл бұрын

@Marty Kaspik There will be no Bitcoin in 30 years - it will be long replaced by something else or the whole idea of crypto will die altogether.

@dexio85

3 жыл бұрын

@Marty Kaspik No.

@user-wv1in4pz2w

3 жыл бұрын

@Marty Kaspik even IF crypto remains the thing, you can't know for sure if the valuable one will be bitcoin or some other cryptocurrency.

@WhosBound

3 жыл бұрын

@@dexio85 fiat will die long before crypto.

@dexio85

3 жыл бұрын

@@WhosBound Sure, keep believing that hahaha.

One of the most interesting and surprisingly inspiring videos I've seen in a while. Thank you, sir!

This video is from 2 years ago and after all the information about the SHA algorithm, the last part is actually the best part. Love it and subscribed it.

1:57 I seriously feared that he was going to read it all

@renecapistran484

3 жыл бұрын

I was looking forward to it

@rex198

3 жыл бұрын

@@briishman8866 tommy stan lmao

@jameschristopher2540

3 жыл бұрын

@@rex198 ok

@-Me_

3 жыл бұрын

@@briishman8866 danny devito

@dharnasahu2506

3 жыл бұрын

I literally skipped 20 seconds

Professor, You're a blessing in this world of wild pseudo-intellectual youtubers. I just found you, thanks for existing.

@MatthewWeathers

4 жыл бұрын

Thanks! That's the most interesting compliment I've gotten all day!

@purdysanchez

3 жыл бұрын

@@MatthewWeathers, sounds like blockchain-bro got butt hurt when you commented on the volatility of bitcoin.

@internetceo

3 жыл бұрын

@@Luiz1179 I have Dash, but nothing is more secure than btc. Btc is stupidly insane secure. That's the whole reason for Alts.

@Luiz1179

3 жыл бұрын

@@internetceo hey dude, bitcoin is old tech; bitcoin has no chainlocks. bitcoin and ethereum are controlled by chinese miners as a result of the mining pool concentration.

@marco281669

3 жыл бұрын

Professor, what classes should I take to learn more about that?

"The Unsolved Maths Problem" The professor is a brilliant mathematician which is ONEderful. He can also make amusing interesting videos, which makes him TWOderful, but the title of the video misleads me to think there is a problem that you might be able to solve if only you are clever enough. Well, to solve it, you only have to process 256 bits of data, about 32 characters of the alphabet. If you let your computer run wild on it, it can't take more than a few hours to unravel that data in every possible way? Then he explains, much more clearly than I could, that the SHA algorithm maps an infinite set of input data onto a finite set of 256 bit strings, which means that SHA is an information losing process, and therefore not reversible. Fortunately, I realised this just by luck, else I could have wasted the rest of my life trying to 'solve' this non-existent problem, like those alchemists, who, in my childhood days, were trying to create gold from processing base metals.

I loved this video, this guy wrote an amazing text before recording. Going to see if he has available books right now.

@MatthewWeathers

2 жыл бұрын

Thanks! That's high praise. No, I haven't written anything. But I'm flattered that you went looking for them.

Feel like if you found a way to crack this algorithm it would be worth a lot more than a billion dollars

@soylentgreenb

3 жыл бұрын

The value of bitcoin would collapse to exactly zero very, very quickly. But you might be able to sell it to the NSA and similar TLAs. It is a solved problem though, there are two algorithms to do it that require ~4000 qubit quantum computers, but those are a couple of years out.

@Lrripper

3 жыл бұрын

@@soylentgreenb damn bitcoin is going to crash when that happens you think ?

@Lrripper

3 жыл бұрын

@@albertodona8789 yeah but quantum computers will only be owned by 2 entities. They cost millions and requires experts to run.

@gewoonfrank478

3 жыл бұрын

It would probably cost you your life

@Artur-fw5qu

3 жыл бұрын

Nah miners could update the bitcoin code and make it resistant to quantum computers, don't worry too much.

I wanted him to finish reading the number out.

@MatthewWeathers

4 жыл бұрын

I'm thinking of making a video that's just that - me reading the whole number. And actually, I'll probably do one for 2^512, too, since that's another important number in cryptography.

@owenlee9474

4 жыл бұрын

@@MatthewWeathers subscribed!

@udeshkumarganesan7040

3 жыл бұрын

@@MatthewWeathers I never passed in Maths for almost a year during my high school days ( Approximately 8 exams in one year). Now, I imagine what will I be , if you were my maths teacher at that time. By the way your channel is very worth, professor. Thank you !

@salman.sheikh

3 жыл бұрын

Matthew Weathers please do!

I watched, I listened, I studied the images........I still haven’t a clue what this is about!

Felt smart watching this, thanks Matthew!

"...billions of dollars could be at stake." **proceeds to play upbeat music**

Never seen this guy before, but he has the makings of a national treasure, the likes of Bob Ross and Mr. Rogers.

@1x0x

3 жыл бұрын

he looks so familiar but idk why lol

@ushergold5149

3 жыл бұрын

@@1x0x think he resembles Mr bean lil bit

@thesonofdarkness936

3 жыл бұрын

Kinda has "Nas Daily" way of speaking...

@ritswik

3 жыл бұрын

and MrBean 😂

@musa2775

3 жыл бұрын

@@1x0x Bill Murray vibes.

3:15 I remember writing these numbers down in third grade and not knowing why at the time. It is clear to me now

You did an amazing job in this video. I've taken this as a hobby in my spare time. Thanks for making this.

UPDATE 2021: I've finally made a follow-up video, describing the basics of Bitcoin: kzread.info/dash/bejne/fq6crMyMgsTKZaQ.html TECHNICAL NOTE / ERRATA: Several viewers have pointed out that this sentence is *technically* false: (1:31) "First of all, the only time you ever end up with the same hash, or the same fingerprint, is if you started with the exactly identical input." They're correct... on a theoretical / mathematical level. But in the *real world* on a practical level, the probabilities are such that these kinds of "hash collisions" are pretty much impossible. That's why I explain this in the next sentence: "There are so many different possible fingerprints that no two inputs have ever ended up with the same fingerprint, and I mean never, in the history of the world." (See discussion about collisions at en.wikipedia.org/wiki/Cryptographic_hash_function) For context: even if every single atom on Earth could hold a different input, that would still only be about 10^51 different inputs. The number of outputs is about 10^77, a number 100,000,000,000,000,000,000,000,000 times larger.

@rowanhardman6736

3 жыл бұрын

Fair enough for coming back over a year later to correct your viewers, respect👍

@byondfinity2538

3 жыл бұрын

um, hello, may i ask, does all this uh "preciseness" means or suggest an inrelligently designed universe? i mean, does it mean God exists? plz reply, txx

@TheImmortalArmy822

3 жыл бұрын

@@byondfinity2538 not exactly, but it really just depends on your view. Most religions are based on faith, which is believing something even though it can't be proven true. Nothing can prove that a god exists unless he came down and personally told everybody, but that would eliminate the whole point of faith, eh? If you believe that the universe is so precise that a god must have created it, you keep on believing that, but if not, then don't. Like I said, if the existence of a god could be proven, then the entire aspect of faith would become void.

@LukasThyss

3 жыл бұрын

@@TheImmortalArmy822 what a nice and respectful reply! good stuff☺️

@NoEgg4u

3 жыл бұрын

@@rowanhardman6736 The host did not correct his viewers. He made an excuse for why his claim was invalid. There are an infinite number of files that can exist (so much for the number of atoms), whereas there is a finite number of hash results. Finding the hash collisions is a daunting task. In fact, if something is impossible, it is today's computers having no where near the computing power to take on the task of finding collisions. That does not mean that the collisions do not exist. They do exist. They have to exist, because there is no maximum number of files, yet there is a ceiling on the number of hash values.

I am sure, someone should have got it in stack overflow

@mukhamediyarkudaikulov2453

3 жыл бұрын

ikr a bunch of idiots sitting at their desks all day failing to google it smh

@marciolucena4999

2 жыл бұрын

Hahahahaha i'm sureee

@hotshot17225

2 жыл бұрын

They'll just shit on you and tell you to use search, the question was already answered.

@orlovsskibet

2 жыл бұрын

Possible duplicate comment.

@michaelszabo3071

2 жыл бұрын

@@orlovsskibet 🤣😂🤣😂🤣

This was by far one of the best youtube videos I have ever watched. Explained so well! Thank you sir!!!

@AssFaceNFT

3 жыл бұрын

Im only 47 seconds in and i know i can safely say this and be amazed by the rest!!!

I love the structure of how you explain things definitely subscribed

: Quantum computer enters the room : Exits at the same time

@gillesbkf4315

3 жыл бұрын

Because it solved the problem that quickly

@EM3SonSon

3 жыл бұрын

@@gillesbkf4315 Yesn't

@benjaminakrish

3 жыл бұрын

Because superposition.

@martiddy

3 жыл бұрын

When I run my code in a quantum computer it will run successfully and crash at the same time.

@stevenchristy6156

3 жыл бұрын

Is the quantum computer dead or alive?

I wish my university professor was like this in explaining . they make it more complex instead of making it more understandble .

@levi_exiled8579

3 жыл бұрын

SAMEE. I hate my math professor for that. He can't explain nor understand us. Sucks.

@nfly1259

3 жыл бұрын

If they explain so said subject in a complex way, then it just means that they dont understand so said subject enough to teach it

@menyasavut3959

2 жыл бұрын

so, tell me, have you understood how SHA256 works, by watching this video?

enjoyed it man!! how lucky are those kids who get to be taught by a prof like you!!

Simplicity equals great explanation! Awesome video!

You are so talented for explaining this idea in a way that's not only interesting, but makes sense

@flipflopsforlife3105

3 жыл бұрын

Imagine the way to reverse it is by not doing anything but wait

One day one mathematician will solve this problem and be like "That was fun, time to post my results so anybody can see it"

@thomb.9013

3 жыл бұрын

*after mining like 100million of bitcoin and claiming they had a extremely powerfull super computer

@gergelyjakovac3063

3 жыл бұрын

It might be theoretically impossile to compute the inverse of the hash function in a feasible time. It would mean that no mathematician can figure it out ever.

@realdragon

3 жыл бұрын

@@gergelyjakovac3063 Not with that attitude, if millennial problem can be solved this also probably can be solved

@elib2670

3 жыл бұрын

Couldn't be more apt

@TomGalonska

3 жыл бұрын

@@realdragon Well, that's exactly the point. If p != np holds true, which is one of the unsolved millenial problems, it would be impossible to reverse SHA256 in polinomial time. And we shouldn't worry about SHA256, that one looks pretty solid. We should worry more about RSA, which would be completely vaporized if quantum computers ever get feasible.

Why this in my recommended? I don’t even like math nor understand it, but somehow this guy kept my attention for 5 minutes straight and I was interested. His explanations are so easy to understand.

Vertly clear and fast explanation of huge topic. Many people spending hours on video explaining somethinf and still is no my clear for me but here I get it.completely

Teacher: "the test isn't that hard" The test:

2:30 - I’m gonna destroy an alien society by changing this zero to a one

@gmrn3014s

3 жыл бұрын

that just made a lot more sense

@daredevil6145

3 жыл бұрын

its 'waba laba dub dub' reference, lol

Incredible explanation, not inteded to be technical which could be messy for begginers, but an explanation for everyone, good job

This video will still be relevant 20 years from now.

This video is underrated.

@Counterstrikeenjoyer

3 жыл бұрын

Indeed

@issa3760

3 жыл бұрын

@UCG9zvV-DlBQlSxjIFe8RWHA 😐😐😐

Math teacher teaches you how can you mine bitcoin faster. Love it

@chocola3538

4 жыл бұрын

To mine Bitcoin Faster Try Block chain👌🏿

@orangeboy97

4 жыл бұрын

He has a computer science degree so it makes sense

@melodykuromibebbies2138

3 жыл бұрын

@@orangeboy97 he does? :)

@staborter1397

3 жыл бұрын

Are you from Lithuania cuz im from Latvia and we use "ū", but LT usually use "as" in the end of the word?

@paulgoogol2652

3 жыл бұрын

Nope. He just says that it could make you very rich if you found a faster way to do it.

This is such a great video! Thanks

Fast, precise, understandable .........smart & very expresive way to deliver information .thanks.

@MatthewWeathers

2 жыл бұрын

Thanks! That's my goal. See the follow-up videos about Bitcoin and cryptocurrencies for more info.

anyone else thinkin "aight imma get to cracking sha 256 right now"

@ramanpalyal

2 жыл бұрын

I saved the video, so I can solve it in my free time

@LSD123.

2 жыл бұрын

I can barely navigate the internet, i got no hope...

I already figured out the answer years ago!

@nameless.8056

3 жыл бұрын

yeah sure lol

@HarryJurtz

3 жыл бұрын

Ok Elon musk

@HarryJurtz

3 жыл бұрын

I bet you used hacks

@ohz4191

3 жыл бұрын

That is how you got rich 🧐

@Mr.PM1993

3 жыл бұрын

haha very funny Elon

This was a great watch. I slowly find myself watching more videos that have to do with Cryptography and Algorithms moreso now that I'm enrolled in school.

@MatthewWeathers

2 жыл бұрын

Thanks. I made a couple of follow up videos about cryptocurrency in general. See the latest two videos on my channel.

First time viewer and I love this man

clicking on this video as if I'm going to solve the problem XD

Excellent explanation! Thank you!!

@MatthewWeathers

2 жыл бұрын

Thanks! I appreciate hearing that.

I love the ending. 😂. Thanks for a great video. 👍

Me : Forwarding 10 seconds after he started saying that BIG number . Professor : You've got the idea 😁😁😁

@rohanofelvenpower5566

3 жыл бұрын

its only the 24th pair.... (counting from 0 :D)

@MOGE_

3 жыл бұрын

same lmao

@waldo3035

3 жыл бұрын

we are all the same

@Official_Zim

3 жыл бұрын

Literally the exact to the dot what happened to me first thing I see is numbers and hear u get the idea

2:02 Him not reading all of it hurt my soul

@mayurgudi381

2 жыл бұрын

🤣🤣🤣

@tenzek4635

2 жыл бұрын

Wait for the director's cut.

You explained everything so well

This is very educative. Thanks.

Decoding SHA would be like revealing everything you ate, everything you pooped, breathed, energy spent, cells shed (or gained), at the exact positions of your body at a specific point of time to show you how you looked like as a baby (or not)

@robertpendzick9250

3 жыл бұрын

A star trek transporter, glad this problem is solved in the Star Trek time line.

@NightmareCourtPictures

3 жыл бұрын

Ya exactly. Everyone that understands chaos theory, knows that SHA is computationally irreducible, and that it can never be solved.

@NightmareCourtPictures

3 жыл бұрын

@Kasper Thörnsten I mean okay sure...it can be solved but it will take googlplex years, or a computer the size of a couple galaxies.

@NightmareCourtPictures

3 жыл бұрын

@Kasper Thörnstenno sir, i didn't miss the point you just don't know what computational irreducibility is. There is no "practical" way to solve the problem...you'd have to build something...probably bigger then computational power of the universe in order to solve them in a time frame that is within a practical time-span. The universe is computationally irriducible...means you can't build something computationally bigger then the universe to solve this problem...ie it's BASICALLY impossible to do... like the OP said, it's like going back in time tracking down every single atom you've ever shed and reassembling those atoms to create a picture of you as kid...it would take EONS to solve that kind of problem even with way better computers then the super computers of today.

@timothyblazer1749

3 жыл бұрын

You could in theory do a geometric solution, but the set would be infinite. You couldn't determine the arrangement of unique inputs that created the hash, but you could define the set of all possible solutions. Not terribly useful, but true. To Point out...the problem presented isn't precisely "reversing" a hash either. It's finding a bounded match.

This is just...So clearly explained. I wish University courses included the quick revision of easy concepts as they explain more complicated ones. Makes things so much more smooth, and makes jargon less intimidating and confusion.

@abrahamsanchez7455

2 жыл бұрын

It’s so funny I see this comment everywhere here it’s true tho they needa teach better smh they should watch these type of videos to use for examples

This is the best youtube video I have ever seen... literally, this video filled me with child like wonder again, I am motivated again!

Great explanation of what a hash function is as well of SHA 256

It’s crazy because Mathew weathers started KZread in the year of 2006

Professor Weathers literally changed my life with a sunk cost lecture. It's always nice when I accidentally stumble upon another one of his videos every few years. I'll always be indebted.

@MatthewWeathers

3 жыл бұрын

Mike! How's it going?!? Yes, I remember that lecture vaguely. I'm glad you like my videos.

@ridearodeo8858

3 жыл бұрын

Can you please share the link to the lecture Mike?

@rhpmike

3 жыл бұрын

@@MatthewWeathers Doing well thank you! Glad to see you're still sharing your passion with students. @Ridearodeo sorry it was an in-class lecture that I don't believe was recorded. It wasn't even the subject matter of the course. I'm genuinely unsure of what led Weathers to teach the topic, but it landed at a critical turning point in my life.

@MatthewWeathers

3 жыл бұрын

@Ridearodeo I don't remember exactly what I said, but I was explaining the Sunken Cost Bias (or Sunk Cost Fallacy). Here's a video that explains the concept well: kzread.info/dash/bejne/eoF2ua-dgJOTpMo.html

@ridearodeo8858

3 жыл бұрын

@@MatthewWeathers thank you very much Matthew

👍 Just watched the video and I loved it! Hit that like button and subscribed to your channel. Can't wait for more amazing content like this! Keep up the great work! 👊😄

Thank you for interesting topic!

This was actually quite an interesting video. I'd hope to see more like this in the future!

Amazing explanation! I always thought I knew everything about hash algorithms but you just explained it so much more clearly.

Congrats! Good video!

The last "dramatic" part is total win! :-D

Man, I have never been so excited to learn coding and math. You explain it very well and very simply, which shows you clearly understand it well yourself. Thank you sir.

Very nice video! I'm glad I checked your work out. Have to agree with previous commentator that this is one of the best overviews on this very interesting topic. Keep it up :)

I learned something today. Good video

Cool Video 😂 especially the end where you run from the nsa hahah

even though i already knew this stuff, it was explained so awesome that i felt like i learned it all over again!

I learned so much in such a short video. Thanks Prof!

@lutronc4412

3 жыл бұрын

You learned false information about bitcoin. 21e8

The solution involves the following methods: 1. Ray Tracing 2. Convolutional Neural Network 3. Nearest Neighbour Clustering in a hyperplane, the dimensions of which are determined by a parametric equation taking its values from coefficients you derive from the hash. This all came to me in a dream - it’s up to one of you maths geniuses to make it work 🤓 Meanwhile I’ll be trying my luck on the scratch cards 🥳

Thank you very much. I enjoyed watching the video.

@MatthewWeathers

2 жыл бұрын

Thanks. Glad you enjoyed it.

I’m glad there are smart people out in the world to work on this stuff, whatever it is

@disobeytoday4685

3 жыл бұрын

The only thing I learned from this video was the conspiracy theory at the end. Even when I try to get away from conspiracy theories, they follow me around.

This is one of those videos you wish you could like and favorite twice...So succinct and informative. 👍

@robertpendzick9250

3 жыл бұрын

Every time you like it you change its SHA256 number so is it the same object that you are liking or a new one?

Excellent explanation. Thank you🙏🏻

@MatthewWeathers

2 жыл бұрын

Thanks. Glad you found it useful.

Loved it, thanks!

@MatthewWeathers

2 жыл бұрын

Thanks. I appreciate that.

Very interesting video, subscribed. I've always wondered what makes a hash value a bitcoin. I havent ever seen anyone ever explain this complex stuff in this easy to understand way. I'm sure you are a fantastic teacher, your students are lucky to have you!

@saurabh945644

3 жыл бұрын

I think 3blue1brown have very simple and detailed explanation.. much better than this.

Best KZread performance I've seen. In a long time!

Liked and subscribed already your fan!

I enjoy rewatching this

this was so well explained i haven't done any reall math in longer time and could understand everything thanks very much

This is really fascinating, thank you!😄

5:48 When I put all my effort trying to make a 5 year old laugh but he walks away poker faced.

the fact that I understand everything this guy is talking about... does that make me a geek??????

Brilliantly done! I loved it.

Passwords are typically saved as hashes because of the presumed security to doing so. However, some common hashes have been reused with default seeds for so long that we can actually do reverse-lookups of known passwords. People have pre-computed the hashes for all possible passwords with 6-13 (ish) characters and compiled them as "rainbow tables" which can be used to look up a password based on the hash. Which is why from a security admin perspective, it's important to change the default seed used in your hashes, and from a user perspective it's important to not reuse passwords.

@cat47

8 ай бұрын

well, you would actually want to use a _password_ hashing algorithm like bcrypt or argon2. Bcrypt, I know, has builtin password salting and you can very easily change the amount of time it takes to hash a password, meaning that even if someone got a hold of your hashed passwords, in could take anywhere from nanoseconds to years to crack your password, depending on what difficulty level you choose for your hash, though realistically one would use somewhere around two seconds. Two seconds is a very, very, long time compared to nanoseconds for a sha256 hash.

I thoroughly enjoyed this

This was absolute gold standard content!!

@MatthewWeathers

2 жыл бұрын

Thank you. That's very kind.

Coolest computer science professor I ever had in college, Matthew Weathers. Hat tip, to you sir. 🎩

@MatthewWeathers

3 жыл бұрын

Thanks, Brian. You saw this Bitcoin video before it started getting thousands of views in the past week.

I was with you for the first 30 seconds but then I was completely lost the rest of the video.

This guy is so brilliant!!!

What an excellent video. Captivated my attention totally.

This is one of the most simplified and well explained SHA256 algorithm explanation i have ever come across. I instantly liked the video just few minutes in. You are a great teacher. If i was to advise anyone to attend Biola Uni, it will be because of you. Keep up the great work, will love to see more videos like this (or the airplane haox debunking video) cause April fool is just once a year and i love really your content :)

@MatthewWeathers

4 жыл бұрын

Thanks! I appreciate the feedback. I'm actually at VidCon today (the annual KZread conference in Anaheim, California) learning about making better videos more frequently. So hopefully, you'll see more in the coming weeks!

@relaxwithai

4 жыл бұрын

@@MatthewWeathers That's great news. Can't wait to see more content from you :)

Love the info!

A better problem is fonding Fermat's actual proof of his enigmatic problem.

wow !! Very interesting explanation, easy to understand

1903: Man will never be able to fl... 1969: Man will never walk on the moo... 2022: Man will never solve SHA 25...

@amercya2953

2 жыл бұрын

We in 2021 bro! But I agree, never is a stupid word.

@fishussugon3215

2 жыл бұрын

@@amercya2953 never say never

@user-oo2ej1re8t

2 жыл бұрын

@@fishussugon3215 You just said it twice

@zedzedder4947

2 жыл бұрын

@@user-oo2ej1re8t never say never say never

@planb6504

2 жыл бұрын

Lol. The complexity of breaking this algo infinitely harder. You are talking about a computer guessing a grain of sand in the universe. You will have cure for every disease if that level of computing is ever invented