Reading assignment: Hashing

Blockchain and Bitcoin 101
#644
  1. 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?
Pre image resistance, which makes it extremely difficult to determine the input from the hash because of its 256 bits length.output.

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#645

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

Why is this hashing algorithm really hard (almost impossible) to brute-force?
It is extremely difficult because you would need to make an astronomical amount of guesses to determine the input which would take much to long

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#646
  1. SHA-256
  2. Takes a lot of computational power and resourses so it becomes almost a impossibility
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#647
  1. SHA-256
  2. The amount of computer power it would take would cost a fortune and not even guarantee you the chance to double spend making it inefficient to try to manipulate
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#648
  1. The hashing algorithm used in Bitcoin is called SHA256.
  2. The SHA256 hashing algorithm is infeasible to guess by the brute force method as it will take countless years to guess the input.
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#649

  1. sha 256

  2. because of so many codes, its not worth the search

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#650

The hashing algorithm for bitcoin is called SHA-256. (Secure Hashing Algorithm 256). The hashing algorithm is hard to break due to how long it would take to just fine one random input, hash it, match it with the output hash and continue the same process over and over until the whole input was found.

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#651

  1. SHA 256

  2. This hashing algorithm is hard to brute-force because the amount of computations needed to perform is infeasible. Trying to get a matching values will prove to be very time and energy consuming.

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#652

What is the hashing algorithm called used in Bitcoin? sha256
Why is this hashing algorithm really hard (almost impossible) to brute-force? Brute-Force is accomplished by trial and error. Given 256 bit value solution. On the average case it would take 2^256 / 2 attempts to find the solution or a very long time.

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#653

1.-
SHA256
2.-
Because independently of the input the function will return always a string of the same length, If the set of inputs its big enough it is almost impossible to guess the input.

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#654
  1. What is the hashing algorithm called used in Bitcoin?
    SHA256
  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    Every unique message that is hashed has a unique 256 bit length output. Therefore, to view a message requires the decoding of the unique 205 bit output, and that takes a very large amount of time( basically impossible when compared to guessing the combination of a 52 deck of cards randomly shuffled.)
#655
  1. A hashing algorithm ([Bitcoin uses SHA-256]
  2. It would take so long, probably long that many life times combined indefinitely or to the end of time [if such thing exist].
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#656
  • What is the hashing algorithm called used in Bitcoin?
    SHA256
  • Why is this hashing algorithm really hard (almost impossible) to brute-force?
    Because the hash function is one-way: from input to output only. This means, the amount of time that needs to be put into guessing, would make it almost impossible.
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#657
  1. What is the hashing algorithm called used in Bitcoin?

Bitcoin uses SHA-256

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

Technically, for a miner to use brute-force he needs to come up with a the result while hashing the block, concatenate it with the nonce, which is a completely random string of values, hash all of that again, and match the results with the difficulty level.

If the results are below or equal to the difficulty level, it is accepted, and the new block is created to the blockchain. If not, they must hash again and repeat the process with a new nonce each time until the results are less than the difficulty level. This of course is highly unlikely. The number of possibilities is too high with a 256 bit hash that makes brute forcing infeasible.

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#658

  1. Secure Hashing Algorithm-256

  2. Due to a property in the hash function that is called Pre-imaged Resistance which means that since the size of the algorithm is so big and the output changes dramatically even if you change a piece in the code, it’s almost impossible to hack it.

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#659
  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 number of possibilities are huge and will take a long time to go through all the cases.
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#660

  1. SHA 256

  2. it is almost impossible because cryptographic hashes are pre image resistant. that means you cannot getbthe input from an hash function. this means that to brute force it will take so much time which makes it irrelevant!

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#661
  1. SHA256
  2. The calculation of the input via the hash value (output) is so difficult it would take too much time to calculate (= to much cost/computation power)
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#662
  1. SHA 256
  2. To guess and try the input hash would take multiple lifetimes to achieve.
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#663
  1. Sha256
  2. A new block is only added once the difficulty level is confirmed as high than the previous block. The hash function will continually adjust the nonce until it is satisfied with the difficulty of the hash. To decipher the nonce and hash block concatenated combination would take sifting through an unfathomable number, which is unfeasible to achieve in a lifetime (or perhaps multiple lifetimes). Even you were to successfully decipher, making any change to a hash block would significantly impact the outputs of every previous hash as they are all associated using pointers.