Reading assignment: Hashing

[levinardo]

1. What is the hashing algorithm called used in Bitcoin?
   SHA256
2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
   It is really hard / infeasible because it has to compute one single deterministic input that will have the same hash value as the info you want to verify. Basically someone needs to make up to 2^127-1 guesses to find the correct answer.

[Douglas]

Bitcoin uses the hashing algorithm “Secure Hashing Algorithm-256” SHA-256.

A successful brute force attack on SHA-256 would be extremely difficult because the odds of guessing the input that resulted in a particular output are astronomically high.

[Phlpp]

• What is the hashing algorithm called used in Bitcoin?
SHA-256
• Why is this hashing algorithm really hard (almost impossible) to brute-force?
Because the number of attempts is so high that this is not really feasible.

[Jacquesachille]

1. Bitcoin’s hashing algorithm is SHA-256
2. The hashing algorithm is nearly impossible to brute-force, because the pre-image resistance inherent in cryptographic hash functions creates extremely complex hashed outputs. These would essentially require a guessing game that would take extremely long.

[CryptoUnicorns]

1. BItcoin hashing algorithm is SHA-256

2. Brute-force is easy to try own s chance like playing the lottery. Winning the jackpot by brute-forcing until mastery at it would be like non-stop best-computer-weaponed lottery playing over hundreds of years. We have probably better to do with our life (s?) time.

[funkpowerrocket]

1. What is the hashing algorithm called used in Bitcoin?

SHA-256

2. Why is this hashing algorithm really hard (almost impossible) to brute-force?

As the output is always 256 characters in length the probability of guessing that output is so low that it wouldn’t be possible in someone’s lifetime

[Rob03]

1. SHA-256
2. In order to find the original input, the brute-force method requires you to choose an input you assume to be true and hash it and then confirm the output the algorithm generated is the same as the one you are searching for. You have to go through all the possibilities until you find the correct output hash which will take a lot of trial and error and if you are unlucky you might exhaust all possibilities in this process.

[Gunnar1]

1. What is the hashing algorithm called used in Bitcoin?
   Ans. SHA-256

2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
   Ans. The 256 characters of the hash output cannot be guessed within reasonable amount of time.

[Eva]

1. The hashing algorithm used to mine Bitcoin is SHA-256. It produces an output code of exactly 256 bits. This output is relatively unique and the chance of the output having a collision with another output is very small, so as to conclude that a hash is indicative a particular transaction and, for comparative purposes, only that transaction.
2. This SHA-256 is so difficult to break since its factor is concatenated to a group of random numbers exponential in size making the solution infeasible as dealing with all those possible random numbers within the equation would literally take generations to calculate down to the desired result. H(k I x) = Y
   where the function of H is k (exponentially large random number within set) concatenated to x (factor sought = Y (Hash result @ 256 bits).

[theRealLos]

1. SHA-256 (Secure Hashing Algorithm 256)
2. Because there is a very high number of possible inputs, such as that guessing an input based on the hash is not impossible, but it is incredibly time-consuming.

[RagnarAces]

1. SHA (256)
   2 Because of one of the properties of Hash function whis is the pre-image resistance.In other words, given H(X) it is infeasible to determineX, where X is the input and H(X) is the output.

[daninvest]

1. It is called SHA 236 (Secure Hasing Algorithm)

2. Because the probability of obtaining the same hash twice is near 0 (SHA 256 has 2^256 different possibilities)

[dapp.coding]

1. What is the hashing algorithm called used in Bitcoin ?
   The hashing algo used is called SHA256 or Secure Hashing Algo with 256 bits outputs.
   

   
   
   Find out more about SHA-256 Algorithm

2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
   It’s almost impossible to force because it will take forever to get the match using brute force algo.

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[Alko89]

@daninvest

Because the probability of obtaining the same hash twice is near 0

This would be a collision. But its true that if you want to brute force a hash function you might not care about getting the exact same input, just finding an input that would return the same output.

[Mynor]

1. SHA 256

2. It’s not “impossible,” it’s infeasible. It simply isn’t worth the time invested because it will take ions.

[Jari_Landman]

1. Sha 256
2. Because of Pre-Image Resistance. It would take infeasibly long to find the input of the given output.

[CanadaWhite]

1. The hashing algorithm in Bitcoin is called a SHA-256 or Secure Hashing Algorithm 256.

2. The SHA-256 hashing algorithm is really hard/almost infeasible to brute-force because the brute-force method implies that you pick a random input, hash it, compare the resulting hash with the target hash and keep guessing or repeating it until you achieve a perfect match to your random inputs hash and the target hash. Basically the same as guessing a password with unlimited chances, days, months, years and lifetimes to do so

• So, while it is possible to break pre-image resistance via the brute force method, it would take so long that it wouldn’t matter or be worth it to do unless you got it on your very first guess. LOL!

[wellydawg]

1. What is the hashing algorithm called used in Bitcoin? SHA-256 (Secure Hashing Algorithm 256)
2. Why is this hashing algorithm really hard (almost impossible) to brute-force? It would take so long to break that it doesn’t matter

[LALauw]

1. Bitcoin uses the hashing algorithm SHA-256
2. Determining the input by brute-forcing the hash takes an astronomical long time. Because by brute-forcing you’re actually guessing random hashes. 2 ^ 256 possibilites.

[Raihan]

1. The hashing algorithm used in Bitcoin is called SHA 256.
2. The hasing algorithm is nearly impossible to brute-force because the probability of finding the input on average is 2 to the power 127. It would take an extremely long time to go through all those possibilities.