Reading assignment: Hashing

Blockchain and Bitcoin 101
#524

  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?
    In order to brute-force this hashing algorithm you would have to 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 your life-time, your succesor’s and even more to achieve

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#525

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

  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    Trying to ‘re-engineer’ the input from the output by brute-force is almost impossible. Meaning, it theoretically is possible but would take way too long.

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#526
  1. What is the hashing algorithm called used in Bitcoin?

SHA256

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

This hashing algorithm is really hard to brute force because the sheer number of random guesses it would take to match the input and output hash would take multiple lifetimes to complete.

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#527
  1. SHA-256
  2. It would take extremely large computations (computational power/energy) and time to find 2 inputs that produce the same output in a hash function (i.e. collision). It is not impossible, but it is not feasible.
#528

The hashing algorithm used for Bitcoin is Sha-256.

The hashing algorithm is really hard to brute force because the hash changes whenever a string is changed. Example: T=123456 while t=654321 so when you add Ta=123456789 ta=654321789.

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#529

  1. What is the hashing algorithm called used in Bitcoin?
    The hashing algrorithm is call?
    The hashing algorithm in Bitcoin is called SHA 256 (Secure Hashing Algorithm 256)

  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    Brute-force method basically means that you have to pick up a random input, hash it and then compare the output with the target hash and repeat until you find a match. this is almost impossible due to the size of the Hash 256 bit, it would take a astronomical amount of time to pick the correct Hash.

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#530

  1. SHA-256 (Securu Hashing Algorithm 256 bit)

  2. Because At worst case you would need 2^256 attempts to guess the input, on average half of that (2^256 / 2), and the change of you guessing the input within reasonable time is astronomically small

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#531
  1. SHA-256
  2. The significantly high number of possible inputs to test to arrive at an output makes the brute force method nearly impossible.
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#532
  1. What is the hashing algorithm called used in Bitcoin?
    SHA-356
  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    mathematically infeasible
#533

SHA 256

because it takes too long. There are too many possibilities.

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#534
  1. Sha-256

2.the amount of possibilities is so large it is close to impossible to find the input from the hash . It would take many years

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#535
  1. SHA-256
  2. Because with a 256-bit hash, and given that even the smallest of changes changes the whole has output, it would take, on average, about 2^256/2 attempts to find the answer. This would take extremely long.
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#536
  1. Bitcoin uses SHA 256
  2. Hashing algorithims are almost impossible to bruteforce because there are just way to may possibilities. You would basically need to know the answer to match the correct hash.
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#537

Yes, you described a collision. But with brute forcing we mean to guess the input from a given output. So you need to keep guessing, hash it and check if the hash matches the one you want to brute force.

#538

  1. sha-256

  2. Each input has a unique output(digital fingerprint) Input can = output but output can Not = input. One way transaction

#539
  1. SHA-256
  2. The guessing of the right output is very time consuming because there are nearly infinite possibilities. Maybe with quantum computing in a few years (10-15), the SHA-256 hashing could get brute forced more faster. But this is not only a problem for cryptocurrencies (also for the internet…)
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#540
  1. SHA 256, Secured Hashing Algorithm 256
  2. Because you would have to go through the entire hash in order to try and find the input. The odds are simply astronomical, but it can be done, it would just take a very very very long time, at best.
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#541

1 - Bitcoin uses SHA-256 algorithm
2 - This is due to the hashing mechanism. All hashes have the same length and even a small change in the input completely changes the output. This is called pre-image resistance. Trying to find an input from the output will require several life times. Therefore, it is not impossible but would take so long that is not feasible.

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#542
  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 every input will have its own unique hash. Even the slightest change in inputdata changes the hash totally. Its possible to get two hashes that collide but it would take so much time it does not matter.
#543
  1. SHA-256
  2. Because it takes so long
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