Reading assignment: Hashing

Blockchain and Bitcoin 101
#1530
  1. SHA-256
  2. There are too many combinations for one person to practically get the same result as another person in a reasonable amount of time.
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#1531
  1. SHA-256
  2. Because the output hashes are infeasible and it would take to long.
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#1532
  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 that is 2^256 of possible outcomes that the answer could be, and to brute-force your way to the answer by trying random calculations until you found the correct answer would take too long of time to solve.
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#1533
  1. What is the hashing algorithm called used in Bitcoin?
Secure Hashing Algorithm 256 or

**SHA-256**

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

Hashing algorithms through brute-force is incredibly hard and nearly impossible (although not completely impossible), due to the cost of effort being implemented by attempting through so many possible options. Brute-force is used when the problem size is limited and the output candidate solutions are a manageable size.

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#1534

  1. The hashing algorithm used in bitcoin is called SHA 256, which produces a 256-bit hash.

  2. The hashing algorithm is difficult because it functions as a Proof of Work (PoW) mechanism, which in turn rewards miners for mining new bitcoins and adding new blocks to the blockchain.

If the difficulty level falls, more miners will mine, so the difficulty level is then readjusted upwards. This helps to balance the number of miners with the rewards available, which in turn keeps the blockchain moving and keeps the supply of new bitcoins steady and predictable.

Miners can solve the algorithm because their machines can use brute-force, i.e. they can generate a huge number of random guesses until they finally match the output with the target hash, which is then checked by other miners, and if correct, allows new blocks to be added to the blockchain.

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#1535
  1. Bitcoin uses the hashing algorithm calls SHA-256 ( Secure Hashing Algorithm - 256 )
  2. It is infeasible to brute force because you check all 2^128 possible answers on average you would have to guess 2^127 times which in words is about 100 undecillion attempts, so, good luck with that
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#1536

  1. SHA-256

  2. To brute-force SHA-256 requires a huge amount of computation and would possibly take a lifetime (or more) to get a result.

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#1537

What is the hashing algorithm called used in Bitcoin? SHA-256 (Secure Hashing Algorithm 256)

Why is this hashing algorithm really hard (almost impossible) to brute-force? The chances of matching the input (that is then hashed) with the target output is astronomical, since there is a potential list of 2^128 possible combinations of the algorithm that can be derived. Furthermore, the amount of time that it would take to get a match is exponential.

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#1538

1.- SHA-256 (Secure Hashing Algorithm 256).

2.- Because 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. Due to the amount of data already generated in the blockchain becomes very hard do brute-force.

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#1539

  1. SHA 256

  2. It is almost impossible due to the time it will take.

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#1540

The name of the hash function which bitcoin uses is sha-256
It is extremely difficult , if not impossible to reverse a hash function , for all practical purposes it is a one way function . Collisions are very rare in this hash function.

Since a small change in the input produces a big change in the output it would need an unfeasible number of attempts to brute force the amount of computing power needed to do this is unimaginable with our current technology.

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#1541
  1. SHA-256
  2. There are so many possibilities that brute forcing through all of them would be nearly impossible to do in the time frame
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#1542

  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 a hashing algorithm you would have to try random hashes over and over again. This will taken lifetimes to figure out. That is why it is “infeasible” to brute-force.

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#1543
  1. What is the hashing algorithm called used in Bitcoin?
    SHA-256 (Secure Hashing Algorithm 256)
  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    The amount of time it will take is to much due to the amount of data that there is. It will probably take a life time.
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#1544
  1. SHA256
  2. Brute-force would be hard or almost impossible to use as a hashing algorithm because it requires a random input to be chosen, a method that is astronomically impossible.
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#1545
  1. Sha 256
  2. It is impossible to find to input that produces the same outcome
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#1546

1 .-Bitcoin hashing algorithm is called SHA 256
2.- it takes too much time to be break into, that in the end it doesn’t even matter.

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#1547

  1. SHA-256 (Secure Hashing Algorithm 256).

  2. To brute-force 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. So, while it is possible to break pre-image resistance via the brute force method, it takes so long that it doesn’t matter.

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#1548
  1. Bitcoin uses the algorithm SHA256.
  2. The number of possibilities is huge so it is almost impossible so for two people to find the same input is hugely unlikely.
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#1549

Answer the questions below.

  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 brute-forcing it still requires so many guesses. There is a 50 % chance to break the collision resistance at the 3,4×10³⁸th instance.

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