Reading assignment: Hashing

Blockchain and Bitcoin 101
#1630

What is the hashing algorithm called used in Bitcoin?
Answer: SHA-256
Why is this hashing algorithm really hard (almost impossible) to brute-force?
Answer: Its infeasible to look at the output, 256 bits in length and determine the inputs

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#1631
  1. Bitcoin uses SHA-256
  2. the number of possibilities is so great that the time it takes to find 2 inputs to produce the same output makes it pointless to attempt
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#1632

  1. SHA-256

  2. It would take so many trials and so much time that it becomes infeasible.

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#1633

  1. SHA-256.

  2. The level of cryptography is so immense that it’s pointless to attempt brute-force.

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#1634

1 - SHA256
2 -SHA 256 hash has 2^256 different possibilities. Its not free of collisions, but hash has many different possibilities, that is almost impossible to do it

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#1635

1-The Hash algorithm of Bitcoin is called Sha 256

2- Because it will take so much time that at end it won’t be anymore important.

1 Like
#1636
  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 SHA 265 produces a 256-bit hash which has 2^256 different possibilities. To break the collision resistance is very infeasible.

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#1637

1.SHA-256
2. it’s almost imposible to reverse the hash output to the input

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#1638

  1. Bitcoin uses the SHA-256 hashing algorithm.

  2. Brute forcing this blockchain is very difficult due to the sheer number of possibilities this hash creates based on input values. Small variations in an input create a vastly different output. Trying to guess the values would take a lifetime.

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#1639
  1. What is the hashing algorithm called used in Bitcoin?

The algorithm used is SHA 256.

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

The numerous outputs that would possibly be the correct one make the algorithm of Bitcoin really hard to brute-force taking a plethora of time and resources so that it is not profitable.

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#1640

The hasing algorithm in Bitcoin is called SHA 256
SHA 256 is infeasible to brute-force it will take a very long time to guess an input that matches the hash

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#1641

  1. Secure Hashing Algorithm 256 (SHA 256)

  2. A hashing algorithm is really hard to brute-force because of pre-image resistance. “While it is possible to break pre-image resistance via the brute force method, it takes so long that it doesn’t matter.”

Pre-image resistance only works when the given amount of data is very small.

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#1642

1- SHA-256
2- It would take too much time to find a match.

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#1643

1- SHA256.
2- It’s almost impossible to force because it generates 156-bits and they have such a big amount of data that the chances of someone matching the input and output are almost impossible.

#1644

What do you mean? The amount of data you would need is very, VERY large…about half the number of possible hashes to even have a chance of finding a collision.

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#1645

Is this a typo? Its 256 bits :slight_smile:

2 Likes
#1646
  1. SHA256
  2. The algorithm is almost impossible to break because of function
1 Like
#1647

  1. SHA256 is the name of the hashing algorithm used in Bitcoin

  2. Because the function is designed in such a way that the input creates a random unique output that a slight change in the input creates a random seemingly uncoordinated output which makes it nearly impossible to reverse engineer, so that nobody can take an output and find out it’s corresponding input. In SHA256 - the size of the number generated is so large it is infeasible to spend time and power to brute force and find the solution.

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#1648

Bitcoin uses hash function SHA 256

The structure of the chain is comprised by linking hash pointers to the previous blocks in the chain.Any attempt to change a hash in the chain would invalidate previous blocks because ,the backward looking nature of the architechture forces each previous block hash to change. These would not be validated and the altered block would fail and not be included in the chain. Additionally, the actually hashing procedure which validates the blocks, has a feature included in the block calculations in the form of NONCE, which sequentially calculates a new puzzle to solve in order to validate the block.The puzzle is comprised of a random changing string which is added to the original hash to create a new string by way oc concantenation. This insures the difficulty of solving the puzzle, and makes it infeasible to crack the hash code within any reasonable short period of time. Pre-image resistance also plays a major role in the original hash string in that H(A) will nearly not ever be equal to H(B), thus creating a virtually unrepeatable algorithmic derived “unique” string of characters.

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#1649
  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 to brute-force we got to pick up a random input, hash it and then compare the output with the target hash and repeat until we find a match.

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