Reading assignment: Hashing

Blockchain and Bitcoin 101
#564

  1. SHA-256 (Secure Hashing Algorithm 256)

  2. There are too many possibilities.

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#565

  1. SHA-256

  2. The Algorithm is nearly impossible to break via brute force due to the astronomical number of outputs that SHA-256 is able to create. A small change in any input creates a vastly different output.

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#566
  1. sha256
  2. It’s almost impossible to brute force because of the involved algorithm?
    It would require a huge amount of computing power to randomly match hashes.
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#567

1.SHA-256
2. Because there will be 2^256 different possibilities making it take incredibly long to come to the right answer.

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#568
1. What is the hashing algorithm called used in Bitcoin?

SHA-256. It takes an input string and turns it into a fixed length 256 bit number.

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

Because if you “guess and check” there are 2^256 possible values… this is 10^77. Good luck guessing it with any classical computer before the heat death of universe.

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#569

You’re talking about a hash collision, in brute forcing a hash, we mean to keep guessing the input and compare it to the hash you want to brute force

#570

Brute-forcing a hash is trying to guess the input from a given hashed output. You need to keep guessing, hash it and compare if it matches the hash you want to brute force. This will take a very long time to achieve this

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#571
  1. SHA-256 (Secure Hashing Algorithm 256)
  2. SHA-256 is really hard to brute-force because its has Pre-Image Resistance that only gets your result after all the data has been parsed. This can take a very long time so brute-force is considered to be not viable as an attack vector.
#572

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

    • SHA256

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

    • Because the combinations are so many.
#573

Ohhh ok got it got thank you!

#574
  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 infeasible. The amount of computing power required to find the function input is statistically impossible. Probability is similar to searching for one specific atom in all of the known universe.

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#575
  1. SHA 256
  2. Because in order to find a pre-image you would have to go through such an astronomically large number of possibilities that it would be infeasible, and for all intents and purposes, impossible.
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#576

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

  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    Because the number of possible hashes is so large that it would take way too much time to brute-force.

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#577
  1. SHA-256
  2. Because the Hash algorithm has a length of 256 bits, therefore the combinations are immense. It is practically impossible to hack a system created with hash using brute force.
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#578
  1. Bitcons hashing algorithm is called SHA 256 (Secure Hashing Algorithm)
  2. The algorithm is hard because the answer is a guess made millions of times by many miners in order to find the answer which is then logged onto the block chain and then confirmed by other miners
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#579
  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 possibilities is “astronomically large”. Brute-forcing would simply take too long with the current availble resources.
#580
  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 so long time to try so many possibilities that it doesn’t matter.
1 Like
#581

  1. The hashing algorithm used in Bitcoin is SHA-256.

  2. The possible hashes are 2^256, so in order to guess the hash, one would have to check all of the possibilities in a reasonable amount of time. That is similar to checking every individual atom in the visible universe, if every atom had a distinct number attached to it.

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#582
  1. SHA-256
  2. Because it hashes information/data into 256 bit hashes which is nearly impossible to guess.
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#583

  1. SHA256

  2. Because the difficultly rate is raised and lower to insure that the system is working smoothly and also to ensure that the POW process continue and miners do not solve equations simultaneously and create orphaned blocks.