Reading assignment: Hashing

Blockchain and Bitcoin 101
#2772

  1. SHA - 256

  2. Once the hash has been created it becomes irreversible due to the one way mathematical algorithm.

2 Likes
#2773
  1. SHA-256
  2. The sheer quantity of inputs and outputs makes it difficult to find two with the same output.
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#2774
  1. SHA-256
  2. It is nearly impossible to find the input from the output.
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#2775
  1. SHA-256
  2. It is very difficult to brute force because each hash is unique and they cannot be reversed to calculate the initial raw data.
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#2776

It is a Secure Hash Algorithm named SHA-256, which was created by the NSA
It is near impossible with the total number of possibilities being extremely large

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#2777
  1. SHA-256
  2. Since hashing is uni-directonal, the only way to get a correct nonce that produces a result within the difficulty limit, is by guessing. This needs many attempts and luck.
2 Likes
#2778

1.Sha-256
2.It would take a long time to brute force as are endless possibilities

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#2779

1: Bitcoin uses the SHA-256 hashing algorithm
2: SHA-256 is not an encryption function but a hash function. The fundamental difference is that while encryption is a two way function (given the key) hash is only a one way function: given some data you can compute the hash, given the hash it is difficult (and mathematically impossible) to have the data back.

1 Like
#2780
  1. SHA-256
  2. Because you do not know the initial data that created the hash you have to calculate it by trying over and over until you get as close as possible. This means your computer has to work hard to get an answer, the more computing power you have the more chance you have but the more work you will do.
1 Like
#2781
  1. SHA-256
  2. The number of guesses to decrypt the hash is too high.
1 Like
#2782
  1. What is the hashing algorithm called used in Bitcoin?
  • SHA-256 (SHA = Secure Hash Algorithm; 256 = the size of the alphanumeric string, which depends on the hash function in use)
  1. Why is this hashing algorithm really hard (almost impossible) to brute-force?
  • A brute-force is basically a search consisting in subsequently trying all possible candidates for the solution, then checking if the solution is correct. As an action, the brute-force is not difficult to implement and it will finally find the solution, but at an enormously unimaginable cost of time and consumed electrical energy. While this is theoretically possible, in real practice is impossible because such an extremely huge amount of required energy is not available, especially in a humanly tolerable length of time frame.
4 Likes
#2783
  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 it uses a hash algorithm. In order to brute force, you will need to try ever single possible input to get the desired output.
1 Like
#2784
  1. SHA 256
  2. because you can´t reconstruct the initial ingredients from the blended mixture
1 Like
#2785
  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?

Because it uses unique data as the input which are not known and even one comma can completely change teh outcome of the function.

1 Like
#2786

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 algorithm is unilateral using difficult math equations to ensure the function can’t practically be reversed to reveal the original input.

1 Like
#2787

  • What is the hashing algorithm called used in Bitcoin?
    SHA-256

  • Why is this hashing algorithm really hard (almost impossible) to brute-force?
    Because it is only solved unidirectionally. To crack it you would have to feed the exact same input as original hash and this would take infinite number of computations to do.

1 Like
#2788
  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 target is a unique 256-bit alphanumeric code which all Bitcoin miners work to solve.

1 Like
#2789

What is the hashing algorithm called used in Bitcoin? Secure Hash Algorithm (SHA) named SHA-256. This algorithm was created by the NSA within the USA.

  1. Why is this hashing algorithm really hard (almost impossible) to brute-force? The number of possibilities for the outcome is so immense it is extremely unlikely for 2 people to ever come to the same conclusion.
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#2790

Bitcoin’s blockchain uses these important hash algorithm characteristics to run its consensus mechanism.it use proof of work function SHA256
2the number of computational possibilities is so high and 256 hash brute forcing it infeasible

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#2791

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

Why is this hashing algorithm really hard (almost impossible) to brute-force?
The outcome is random and finding the input is hard because of the many possibilities that can be the output.

1 Like