Reading assignment: Hashing

Blockchain and Bitcoin 101
#1890

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?
It takes multiple lifetimes to brute force.

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#1891

1.The hashing algorithm for Bitcoin is called the SHA-256 hash. It was developed the National Security Agency in 2001. It is mathematically the Bruce Lee of algorithms or something like that.
2. It is almost impossible to reconstruct the initial data. The energy that would be needed as well as the time or attempts need is something like 2 to the power of 2256 attempts. And if it did succeed, then what? Hardfork the chain and it becomes elusive to brute force again. Energy and attempts to gain control (time & equipment) make it like mercury. It will simply move in a different direction while trying to tamper with it may poison the person trying to control it-- very dramatic :grinning:

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#1892
  1. What is the hashing algorithm called used in Bitcoin?

A. Bitcoin uses the SHA-256 hashing algorithm.

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

A. It is infeasible to use the brute-force method to solve the SHA-256 hashing algorithm due to pre-image resistance. The length of the hash string that is generated has many characters and any changes made to the input will greatly alter the hash. The probability of reaching concatenation with random inputs, when each input has its own unique hash, is almost impossible.

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#1893

  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?
    The number of possible input of getting the same hash is so huge that guessing the input by brute-force is infeasible (almost impossible).

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#1894
  1. Secure hashing algorithm 256 / SHA 256
  2. There is an exponential factor (2^256) of possibilities making it a very low probability to guess the right input. Therefore, it is feasible but it will take extremely long and unrelevant
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#1895

  1. SHA-256 (Secure Hashing Algorithm 256)

  2. Because it takes to long time to brute-force due to the hashing algorithm BTC uses. It would take more than a lifetime of attempts to brute-force.

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#1896
  1. SHA-256
  2. because the sheer amount of possible answers makes the process really tedious
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#1897
  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? It would take quite a long time to brute-force a probability of 2&256.
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#1898

  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? Because it would take so long (generations) it would not matter.

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#1899

  1. Bitcoin uses SHA 256 hash function

  2. Finding and unknown input implies taking the output reversing the function and finding the input. Bruce force methods imply pickling an input, applying the function, and comparing the result to the known output. Statistically, we’ll need lots of trials to consistently come to the correct answer, so it is not a method to rely on when dealing with SHA 256 functions.

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#1900

  1. What is the hashing algorithm called used in Bitcoin?
    Secure Hashing Algorithm 256 (SHA-256)

  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    2.1 Pre-image resistance - given H(A) it is infeasible to determine A, where A is the input and H(A) is the output hash.
    2.2 The process is puzzle friendly - For every output “Y”, if k is chosen from a distribution with high min-entropy it is infeasible to find an input x such that H(k|x) = Y. In Bitcoin mining, K = the Nonce, x = the hash of the block, Y = the difficulty target within a given level of accuracy.

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#1901

1- The hashin algorithm its called SHA 256 (Secure Hashing Algorithm)
2- Because is Infeasible to determine the original input from it Hash Value

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#1902
  1. What is the hashing algorithm called used in Bitcoin?

SHA-256

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

It is really hard because this hashing algorithm is pre-image resistance. It is infeasible to determine the input data based on the output hash because there are so many hash outputs that it will take forever to determine the right hash output.

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#1903

  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?
    The total number of possibilities is so large and that it would take a lot of computational and processing power to be able to brute-force. They have to keep picking random inputs until it matches while at the same time managing to meet the difficulty level. On top of that, they have to do all this in time, or it won’t even matter.

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#1904
  1. What is the hashing algorithm called used in Bitcoin?

Bitcoin uses the SHA-256 algorithm.

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

A huge amount of processing power its required to continually randomly guess the correct answer to the mathematical problem, given the mathematical probability in an adequate time frame.

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#1905
  1. SHA256
  2. Every hash has the same length, a minor change in the input will change the hash almost completely, it would take enormous processing power to achieve and even then it would be so costly, time consuming with virtually no probability to uncover the input data.
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#1906
  1. SHA or secure hashing algorithm 256
  2. It’s really hard because the data is in another block. The brute-force is not impossible, but it would take too much time and would not follow the quick computation.
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#1907

1)SHA256
2)Brut force would take enormous computing power, and it would take way to long.

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#1908

  1. SHA-256

  2. The sheer amount of time and energy required to brute force is simply absurd. If you just so happen to successfully crack the algo, you’re rewarded with the opportunity of hardforking your new sh*tcoin you aptly named “Bitcoin Brute.” The only problem… the universe ended eons ago and you’re now an AI floating in nothingness with no need to transact value.

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#1909

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

  2. Why is this hashing algorithm really hard (almost impossible) to brute-force? = Because it would take a lifetimes to guess the correct answer in the algorithm. Which makes it infeasible to do so. It’s not impossible but it would take so long that it would be wiser to work on other solutions.

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