Reading assignment: Hashing

Blockchain and Bitcoin 101
#443
  1. sha-256
  2. Takes too long to randomly get a correct hash.
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#444

Ups, i think i mixed them up with collision resistance but anyway thanks for the clarification
Its just a matter of guesses to find the input.
Thanks

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#445

Answer the questions below.

1. What is the hashing algorithm called used in Bitcoin? 
   A) SHA-256
  1. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    A) The time required to brute-force the hashing algo is longer than most lifetimes. So, time and luck are not on the side of a brute force attack.
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#446

  1. Bitcoin uses SHA 256, which produces a 256-bit hash

  2. It will take forever to brute-force. The chances are so slim that it is considered impossible. It will take too long.

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#447

  1. SHA256

  2. Because you have to pick a random inupt, hash it and repeat until you find a match, and the chances of you finding the answer are astronomical because of the large number of possibilities.

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#448
  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 the probability of 2 outputs being the same is too low as each input has its own unique hash
#449

  1. SHA-256

  2. Because it would be expensive and too time-consuming to hash randomly in order to find a matching hash.

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#450

  • 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?
    Because SHA 256 hash has 2^256 different possibilities. 2^256 is a 78 digit number. Although no hash function is collision free, but this would take so long to find a collision.

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#451
  1. SHA-256
  2. It would take to long to confirm
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#452

  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 randomness and complexity of the string of the vast amount of possibilities.

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#453

  1. SHA 256 is the hasing algorithm used in Bitcoin.

  2. It is infeasible to brute force this hashing algorithm because of the immense time and computational effort it would take in order to guess correctly the input of the cryptographic hash function.

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#454

You’re describing a hash collision. Brute forcing an hash is keep trying to guess the input

#455

  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 word is infeasible. Brute force in this case means you take a random number hash it and then compare it to the original hashed number to see if you have a match. You could this easily in the case of the dice, where you have numbers 1-6. But 2 to 128 is such a huge number to use this method on that you would simply run out of time in cracking it. As the article says, it would take so long that it doesn’t matter.

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#456
  1. SHA 256
  2. Because there are far too many guesses to be made in time to use brute force.
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#457

  1. SHA256

  2. The possibilities are so large and unlikely that two people wil get the same result in their life time.

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#458

1 - SHA 256
2 - The hashing algorithim is very difficult to brute force because of the sheer size of possible inputs. In order to find the correct input it would take multiple lifetimes with the computer technology of today.

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#459
  1. SHA-256
  2. A hash cannot be predetermined without actually executing the function on various attempts from an astronomically large set of possibilities.To try every possible combination from such a vast pool of options is “unfeasible”.
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#460

  1. Sha 256

  2. Because even if you make a small change in your input, the changes that will be reflected in the hash will be huge, making it nearly impossible to brute-force

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#461

  1. SHA-256

  2. Because it takes in average 2^127 tries to find the original input.

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#462

1 SHA 256 is the hashing algorithm used in bitcoin

2 because of the pre image resistance prospect of the blockchain. It is unfeasible to work out the input hash from the output hash on larger amounts of data and brute forcing whilst not impossible to achieve would take many lifetimes so is negligible

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