Reading assignment: Hashing

Blockchain and Bitcoin 101
#2151

  • What is the hashing algorithm called used in Bitcoin?
    SHA-256

  • Why is this hashing algorithm really hard (almost impossible) to brute-force?
    Because this Hash has 2^256 different posible results, need to try one by one to find the original imput, This process is feasible but in practical terms it is almost imposible due to the time involved.

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#2152

  1. What is the hashing algorithm called used in Bitcoin?
    A: SHA 256

  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    A: The possibility for two people having the same outcome is highly unlikely purely based off number of possibilities that exist.

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#2153
  1. What is the hashing algorithm called used in Bitcoin?
  • The hashing algorithm used for Bitcoin is SHA-256 “SECURE HASHING ALGORITHM”
  1. Why is this hashing algorithm really hard (almost impossible) to brute-forec?
  • Its almost impossible to brute-force this hashing algorithm because in order to find and input to an output hash you would have to randomly guess hashes that could take an eternity for example several generations before they guess the correct hash. H(A) infeasible to determine. (Pre-image resistence)
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#2154

  1. SHA-256.

  2. The only way to brake it is by brute forcing it and this would require ridiculously long time, because of huge number of different possibilities.

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#2155
  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 you would have to just keep guessing hashes and the amount of time it would take to keep guessing would be infeasible.
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#2156
  1. sha 256
  2. hard to brute-force because there are so many possibilities that for it to be guessed is next to impossible.
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#2157

Reading assignment: Hashing

  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?
    SHA-256 output contains 256 bits. At this moment with the computing power we have today, it will take a long time to use brute force to determine the input from the generated hash.
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#2158

  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?
    Pre-Image Resistance - Because the output hash has so many digits, brute forcing the input hash from the output hash is very time consuming.

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#2159

Bitcoin uses SHA-256

It’s infeasible. It takes so long, that it really doesn’t matter.

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#2160
  1. SHA 256
  2. Because they’re so many possibilities and it will take so long it becomes pointless.
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#2161
  1. Its SHA-256 algorithm used in cryptography applications such as encryption.
  2. Because the output produced by the hasing algorithm is taken by random variable x which cant be back traced to original function and would take years to decode unless quantum computers comes in future and brute force the SHA -256 algo.
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#2162
  1. SHA-256 is the hashing algorithm used by Bitcoin.
  2. In practice, given input A, there will be 1.7 X 10^38 potential inputs from which to choose to determine which input produced the H(A) hash of that input. That search space is … an imaginary quantity that bears no relationship to the known physical universe is so large!!! We are safe … for the time being.
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#2163

  1. SHA-256

  2. Because every input forms a different hash.

For example:

If we take the input ‘Hello’ a fixed 256-bit length hash would be generated for this input
however any slight change within the input such as making ‘H’ a lower case would lead to a completely different hash value of fixed length.

What this means is it would not be easy to find the input which generated the 256-bit hash we would perceive. As a result, it would take an incredibly long-time, requiring an extremely powerful computer or a network of many computers to work together in order to search for an input which would match the hash quickly. The higher the hash rate, the quicker it will be to find the input.

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#2164
  1. SHA-256
  2. Because I am not immortal. The hashing algorithm cannot be brute forced because the amount of time it would take for one to determine the original input based on its hash value. This is due to the pre image resistance and the small changes in the input result in in drastically different hash.
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#2165

1-SHA256
2-because it has a unique digital impression

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#2166

Sha256

Impossible to brute force as it is so time consuming it is literally not worth the energy necessary to achieve.

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#2167
  1. SHA-256
  2. The entire process is completely random, following the proof of work protocol.
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#2168
  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? too many possibilities for the input values that makes it near impossible to determine.
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#2169
  1. SHA-256
  2. It is improbable, not impossible, but also would take a very long time to come up with the exact hash for the given input
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#2170

SHA-256.

The number of possible hashes are 2^256 =~ 10^77. This would be the number of strings (of a given length!) You’d need to check individually before you could be sure of finding a solution. On average you’d need half that, but that’s still beyond realistically available with current and currently even imaginable technology. And all that effort for breaking just one hash.

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