How secure is 256 bit security?
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How hard is it to find a 256-bit hash just by guessing and checking?
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Several people have commented about how 2^256 would be the maximum number of attempts, not the average. This depends on the thing being attempted. If it’s guessing a private key, you are correct, but for something like guessing which input to a hash function gives the desired output (as in bitcoin mining, for example), which is the kind of thing I had in mind here, 2^256 would indeed be the average number of attempts needed, at least for a true cryptographic hash function. Think of rolling a die until you get a 6, how many rolls do you need to make, on average?
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Vídeo
Me chamo Felipe Trader e moro aqui em São Paulo. Comecei no forex a 6 anos atrás e hoje vivo somente do meu trading diário. Aqui no blog conto pra você as ferramentas e serviços que uso pra ser lucrativo.
☝️☝️☝️I was not disappointed by going through him, he got mine save and secured
The naming was really nice
hash ind danish is weed
What an amazing video, what a presentation!!! Please keep up the good work – 2 raise to power 256 times thanks and regards to you
Quantum computer enters the chat…
pretty sure dream could "guess" them first try
Easy
Wait is this math lore
Now in 2022, you're almost at 4^22 subscribers. Keep up the good work
Hey congrats on surpassing 2^22 subscribers!
What about using quantum computer?
100k off from 2^22 subscribers now
The moment you realize it's probably easier to exploit people who set the password instead of this…
funny thing is, since this video has come out, he's gone from 2^18 to 2^22 subscribers. Haha!
Now you're almost to 2²² subs!
Now do 128 bit AES cbc
Now it's 4^10.98th power of subscribers
But is it bigger than 52!
ok, but what about 512 bit security?
4:30 Four years passed and the number of subscribers barely moved: from 2^18 TO ~2^22.
yeah oke but why not use….. 500 bits just to be sure?
please, do a revisited version of this video but with quantum computers and how they could break 256 keys
why is there no idle game with this concept?
3/5
I doubt anybody will ever see this, but I came up with my own analogy to describe how absurdly huge this number really is. FIrst off, I saw in some other random YT video – that humans are pumping out roughly 60 quintillion inputs for the SHA 256 per second. So if humanity continued calculating at this pace, how long would we have to keep computing before we found 2 inputs that equate to the same output?
TLDR: A long fucking time.
Analogy: We have a lot of time to kill, so let's start by imagining that we kill time by walking in a straight line until we reach the moon. Once you reach the moon, turn around and come home. When you get home, (you would have been gone roughly 18 years) buy a powerball ticket. If that ticket wins the jackpot, buy a mega millions ticket. If the mega millions is ALSO a winner, flick a penny into the Grand Canyon.
After flicking the penny into the Grand Canyon, continue on your walk – back and forth from the Earth to the moon and back. Again, when you return to Earth, buy another powerball ticket. The only way you will ever throw a penny into the Grand Canyon, is if both the Powerball AND Mega Millions tickets are winners. As you could imagine, you're going to do this until all 5.45 million cubic yards of the Grand Canyon is completely filled to the brim with pennies. That's a lot of lotto wins!
Of course you haven't even scratched the surface of how much time needs to pass, so we're going to continue on with this pattern – until you have filled the Grand Canyon with pennies 200 times over. Eventually I'm assuming you will get bored of filling the Grand Canyon with pennies, so after 200 of these fills you can switch to the Pacific ocean. The pacific ocean is a lot bigger than the Grand Canyon, and it would take about twice as long to fill with pennies as it took to fill the Grand Canyon 200,000 times. Woah.
Now that the pacific ocean is filled to the brim with pennies, empty it out and find a nice place on Earth to park a Chevy Malibu. Return to the Grand Canyon – Fill it with pennies 200,000 times. Return to the pacific ocean, and fill that with pennies as well. Keep in mind, each penny represents winning back-to-back lotteries after a round trip from the Earth to the moon and back at a walking pace. Each Chevy Malibu is going to be the equivalent amount of time as: filling the Grand Canyon with pennies 200,000 times as well as the pacific ocean once.
How many Chevy Malibus will we have to stack before we finally have run out of possible calculations? Answer: It's a fucking lot of Chevy Malibus. You're gonna stack those babies on top of each other until they too reach the moon. Then you're going to start a new stack of Chevy Malibus – and that stack too will also reach the moon. And then you're going to do another.
and another
and another
and another
until you have reached roughly 33.7249 Earth-Moon length stacks of Chevy Malibus. Now that you are exhausted, sick of pennies, and a little over 61 quindecillion years old, you can drive the last Chevy Malibu down the giant cosmic escalator of Malibus from roughly 3/4 of the way to the moon back to Earth where you will finally get to rest – and enjoy seeing 2 different inputs that provide the exact same 256 bit output in the SHA 256. I can only imagine what those 2 different inputs look like. I hope you'll share with the rest of us. Is it a picture of a Chevy Malibu and the dimensions of a penny? Is it one of the back-to-back lottery winning numbers? Who knows? You do. Because you did it.
So weird when two videos referance themselves haha
Almost 2^23 subscribers rn
2^18 subscribers… guess you're good at this youtube thing
Today, 2³⁶ lol
1 percent of my total power
All it takes is one lucky guess
Time for 2^8192
that's big. LIKE YOUR MO- oh sorry 😉
🤣🤣🤣
Giga galactic supercomputer should have been called the billky way
Imagine 4096bit security
isnt this what quantum computers are for? you can represent all 256 bits using a qbit, meaning you get all 2^256 in only 256 qbits, then you just hope for the best
bump
Also the guys who play Rng summon based games: Rookie numbers
So SHA64 is good enough for like 10years and SHA128 should be a galaxy level? why we still need SHA256 🙂