Reading assignment: Hashing

Blockchain and Bitcoin 101
#242
  1. SHA 256
  2. The number of possible variables and the applied nonce are impractical to find
#243

  1. The hashing algorithm used in Bitcoin’s blockchain is called -
    SHA-256

  2. The hashing algorithm needs to be set at this high rate of complexity and difficulty because of a rate of something called collision resistance which is to do with the probability of hashes randomly happening to be the same from a different input. This is to do with setting how hard it would be to crack [or falsify] the information contained in the post-hash output retrospectively. This is also interlinked with the complexity level that is set for the puzzle to be solved by the miners in order to win the prize for adding the next block to the chain. I think!

#244

SHA 256 (secure Hashing Algorithm)
It generates a very long and difficult number that would take a lifetime or more to calculate.

#245

1.SHA256
2.Brute force is actually comparing an output string to a certain input and see if they relate, now because there is an abundance of options it draws an extermely low possibilty to hit a match.

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#246
  1. SHA256
  2. The time it would take makes it unfeasable
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#247

1.sha-256
2.becuse of the sheer amout of hashes one have to go true to find the right one not even in generation it would be econimical

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#248
  1. What is the hashing algorithm called used in Bitcoin?

SHA 256 (secure hashing algorithm 256)

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

There are so many possibilities that it would take a long time to try them all

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#249

1- SHA256: Secure Hash Algorithm 256

2- Because it would take too much time and too much luck to back-test trillions of theoretical inputs in order to find the one and only which results into the requested output hash. That is made even less likely and feasible by the fact that the hash of the previous transaction on the blockchain is concatenated with the new transaction data before actually processing the new hash.

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#250
  1. Bitcoin uses sha 256 and produces a 256-bit hash
  2. Time-while it is possible to break the target hash with the brute force method it will take a (life time) long time to do so.
#251
  1. Sha 256
  2. It is very difficult to find 2 inputs to produce the same output in a hash function.
#252
  1. What is the hashing algorithm called used in Bitcoin?
  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?

Bitcoin uses SHA 256

It is infeasible to guess the input based on the output thus making SHA 256 very secure.

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#253
  • What is the hashing algorithm called used in Bitcoin?
    SHA256
  • Why is this hashing algorithm really hard (almost impossible) to brute-force?
    a) pre-image restistance. Given H(A) it is infeasable to determine A.
    b) Small changes in input changes the output completely
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#254
  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 there are too many possibilities that it would be unfeaseable too try to brute force it directly, it would probably take a few human lifetimes length.
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#255

The possibility to find the input based on the output is so difficult its impossible
SHA256 is the hashing algorithm for bitcoin. It is impossible to brute force because it would take longer than a lifetime to find an identical input.

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#256
  1. SHA-256
  2. because it would take way too long to figure out the input from the output. Its not impossible, but infeasible.
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#257
  1. SHA-256
  2. Because there is too many possibilities of input to check and compare with output.
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#258
  1. SHA-256
  2. Its infeasible to brute-force this hashing algorithm as randomly guessing the correct input will take astronomically long time. Each block forms a new hash, which uses input from the hash of the previous block. Thus, there is not enough time to brute-force a solution.
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#259
  1. Sha-256
  2. You have to guess the inputs until you find the one corresponding to the provided hash. And there are 2^256 possibilities.
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#260

  1. SHA 256

  2. Because the amount of possibilities will take multiple generations to brute-force

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#261

  1. Bitcoin uses SHA-256

  2. With the process of brute-force you need to take an input and hash this to review the output. Comparing this to the target output you can confirm if this matches. If it doesn’t you need to repeat the process until you find a match. Couple this with the fact that the odds of finding the match are not tilted in your favour; although not impossible. It would take so long that it doesn’t matter.

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