Reading assignment: Hashing

Blockchain and Bitcoin 101
#1046

  1. SHA-256

  2. because it is almost impossible to find 2 functions that produce the same hashing function.

#1047

Thank you Mauro; that clarifies things and makes sense.

Peace,
Joel ♫

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#1048

What is the hashing algorithm called used in Bitcoin?
SHA 256
Why is this hashing algorithm really hard (almost impossible) to brute-force?
To brute force means you would need pick up a random input, hash it and then compare the output with the target hash and repeat until you find a match. This would take a lifetime

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#1049

  1. SHA-256

  2. Because the blocks are linked in a chain, so to alter the details of one would require modifying the details of all preceding blocks simultaneously, which is a near impossible feat.

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#1050
  1. SHA256
  2. The options are so many that trying to guess what that hash means would take several lifetimes.
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#1051
  1. What is the hashing algorithm called used in Bitcoin?
    SHA256
  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    The possibility to find the input based on the output is so difficult its impossible
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#1052
  1. SHA-256
  2. Humans don’t have enough time to crack it
but maybe human’s quantum computers can??
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#1053
  1. Sha 256.
  2. Because is Deterministic, also is pre-image resistant.
    Making a change in the blockchain is too dificult with the current tecnology since it would change the following chains and that will be easy to notice.
#1054
  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 is not impossible but it would not make sense as it would take an unreasonable amount of time to do so. The rationale behind is that even just a small change in the input would generate a completely different output result, therefore random guessing is almost impossible due to the amount of possible combinations.
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#1055

Here we mean why it’s almost impossible to brute force Sha256 hashes. Because the only way to find the input of a hash is to keep guessing it, hash it and compare if the hash is the same. This will take you so much time an energy that this is not worth it.

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#1056

You’re describing a collision. Brute forcing a hash means that you keep guessing the input, hash it and compare if the hash matches the one you want to brute force. It’s like trying out every combination to guess a Pin number.

#1057
  1. SHA-256
  2. In average the brute force method would need 2^256/2 attempts to succeed
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#1058

it becoming clear.thx. Iz

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#1059

1 Secure Hashing Algorithm 256
2 because in average the solution will be found after 2^127 times which is so big that the odds says it almost impossible to do it

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#1060

  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?
    I would take forever to bruet-force it.

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#1061
  1. SHA256
  2. Even though it is possible to break pre-image resistance via the brute force method, it takes so long that it doesn’t matter.
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#1062
  1. SHA-256
  2. I t would take an unreasonably long time to crack ShA-256 as it would require 2^256 attempts across all nodes in the network which is a very long time.
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#1063
  1. Hashing algorithm used in Bitcoin is SHA-256.
  2. It is possible to break pre-image resistance via the brute force method,but it takes so long that it doesn’t matter.
1 Like
#1064

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

  • It uses SHA-256 algorithm.

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

  • Due to its long string 256 bit, one must pick a random input, until it results a matching
    output. It is difficult and time consuming.
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#1065
  1. SHA-256
  2. The possibility to find the input of a certain output is very difficult. (almost impossible)
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