Reading assignment: Hashing

Blockchain and Bitcoin 101
#302
  1. SHA256
  2. 2^256 amount of possibilities will take too long to brute-force to be feasible.
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#303

1- Sha256

2- Because determining x from y would take forever

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#304
  1. Sha 256
  2. Because there are too many possibilities
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#305

  1. The Bitcoin’s hashing algorithm is called
    SHA-256.

  2. Theoretically it’s not impossible to brute-force this algorithm, but technically it doesn’t worth it. It would need an infinite amount of time, probably more than a life time to do so,
    and also, a lot of energy in manner to guess the input based on the output.

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#306

  1. Bitcoins hashing algorithm is called = SHA-256

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

‘The 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.’ Bitcoins algorithm is a 256-bit. Meaning it would take such an enormous period of time to try and break the pre-image resistance that its not worth it (non-feasible). An enormous amount of time.

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#307
  1. SHA-256
  2. Because the entire history of the blockchain would have to be changed
#308
  1. SHA 256
  2. Every random number generated will generate a different hash value, so there is a 1 in 2^256 chance of getting the same hash result as the number required to decode Bitcoin. That will take millions of years to do with a computer.
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#309

  1. What is the hashing algorithm called used in Bitcoin?
    Bitcoin uses a SHA (Secure Hash Algorithm) 256-bit

  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    Because technically with the computer power available to humans on this day and in the foreseeable future it is highly improbable for a person to connect a certain output hash to a specific input hash function. This makes bitcoin highly secure and resisent against brute force attacks. Because the time period to in order to successfully execute a brute force take hundreds of human lifetimes.

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#310

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

Why is this hashing algorithm really hard (almost impossible) to brute-force?
This is due to the property is has called pre-image resistance. This means the number of times needed to brute-force the input by either randomly or sequentially is astronomical so that in practice it is infeasible to determine the original input.

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#311
  1. Sha-256 is the hashing algorithm used in bitcoin.
  2. Why is this algorithm really hard to brute-force?
    The 256 bit hash has properties that have a high min-entropy, lots of numbers, because it uses nonces to concatenate the hash, add two strings together, maintaining the proper degree of difficulty to mine. Also, has pre-image resistance, meaning any small change changes everything.
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#312
  1. SHA 256
  2. Because the possibilities to break it by brute force are so small that it can be neglected.
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#313

  1. A function has a mathematical input who’s rules determine the calculation of the output.

  2. a) even- 2 x 2 = 4
    b) odd- 7 + 10 = 17
    c) even- 0 x 0 = 0

  3. 1st attempt - f(x/4 - 5)

    2nd att. f(x) = (x/4 - 5)

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#314

Sha 256
The 256 algorithm is almost impossible to brute force as it is extremely difficult to find 2 inputs to produce the same output. In order to find a collision it would take longer than a lifetime

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#315
  1. SHA-256 (Secure Hashing Algorithm 256).
  2. you must be incredibly lucky to find that one needle on the whole planet earth :slight_smile:
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#316

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

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

  3. SHA-256 or Secure Hash Algorithm 256

  4. Because when you run input through this algorithm, if you change just one symbol, the output (hash) will change drastically, so it will be almost impossible to guess the input data.

#317
  1. What is the hashing algorithm called used in Bitcoin?
  • SHA-256 is the hashing algorithm used in Bitcoin
  1. Why is this hashing algorithm really hard (almost impossible) to brute-force?
  • The hashing algorithm is really hard to brute-force because the chances of H(A)=H(B) is very low
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#318
  • SHA 256 is the hashing algorithm called which is used in Bitcoin.
  • SHA 256 is very hard to brute-force because it takes 2^256 possibilities to compute the input string.
#319

1.SHA-256
2.It’s hard to bruce-force the hashing algorithm because the difficulty level is to high and is almost impossible to have same result -it will take too long .

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#320
  1. What is the hashing algorithm called used in Bitcoin?

Secure Hashing Algorithm - 256 / SHA- 256

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

SHA - 256 is a 256 bit hash which has an astronomical range of possible outcomes. It would take almost impossible computational power in order to brute force

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#321

SHA-256
Brute force would take to long , not impossible but infeasible
2^256 is a long process

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