Reading assignment: Hashing

Blockchain and Bitcoin 101
#664

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

  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    Because it would take so many guesses to get it right and so much time, it would be useless to do, unless you get very, very lucky!!
    It is so improbable you get it right, that what makes it so hard.

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#665

1 sha259

2 you pick a random input and compare the output with the target hash and report it untill you find a match, the odds are astronomical, it takes to long

#666

sha 256 sorry i made a mistake

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#667

  1. Bitcoins hashing algorithm is called SHA-256 ( secure hashing algorithm - 256)

  2. The odds of success are astronomically high, so it is pointless even to try.

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#668

1: SHA-256
2: There are too much possibilities to find the correct Hash per trying value per value

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#669

1/ Secure Hashing Algorithm 256
2/ A computer would have to try 2^256 possible solutions which is massive

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#670
  1. SHA-256
  2. The Hashing Algorithm has several properties build in the software that will make it infeasible to brute-force, this include deterministic, quick computation, pre-image resistance, small changes in the input changes the hash, collision resistance and puzzle friendly.
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#671

1 SHA256
2/ A computer would have to try in worst case 2^256, which is nearly impossible…

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#672
  1. SHA-256
  2. Even the smallest change cause the entire hash to change. Too many possibilities.
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#673
  1. SHA-5
  2. It would take ages to solve the complex calculations of finding matching inputs and outputs because of sheer improbability. Furthermore, if a block got attacked, the change would be recognized through other blocks.
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#674

1.sha-256

  1. In order to match the output to the input you would need to make so many guesses that you would be dead before you reached the answer.
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#675

  1. The hashing algorithm is called SHA256.

  2. It is very hard to brute-force the algorithm because each input has it´s own very unique hash.

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#676
  1. SHA-256
  2. You’d have to try all inputs in SHA-256 which are in the range of 2^256 and in the worst case scenario you find the correct hash after 2^256 guesses but of course it usually takes less tries. It still takes so many guesses with today’s technology that it is very hard and unpractical.
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#677
  1. Secure Hashing Algorithm (SHA-256) is used in Bitcoin network.
  2. The data set is huge to brute force,and finding the probability of matching input with same output or vice versa in a hash function is difficult. May be in future with Quantum computing, finding the difficulty/input value will be easier.
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#678

1- sha 256
2- because it’s infeasible to determine the input data based on the output hash.

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#679

  1. Bitcoin uses SHA-256 which gives an output of a fixed 256-bits length.

  2. The total number of possibilities is so large that it is unlikely having the same unique hash in their life time.

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#680

  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? There are so many possibilities it is most likely to take so much time it would be worthless

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#681

  1. Security Hashing Algorithm SHA-256

  2. So it can’t be altered/hacked.

#682

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

  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    Pre-image guessing will take 2^128 computations to back test and yield the input which makes it highly improbable to guess the hash + nonce of the previous block.

#683
  1. SHA-256
  2. Because of the huge number of attempts required to guess the correct hash.