Reading assignment: Hashing

Blockchain and Bitcoin 101
#3293

  1. SHA-256

  2. Hashing algorithm is really hard to brute-force because a single change on an input drastically changes the hash output, therefore trying all input combinations to exactly match the hash output would take infinitely long.

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#3294
  • What is the hashing algorithm called used in Bitcoin?
  • SHA-256
  • Why is this hashing algorithm really hard (almost impossible) to brute-force?
  • one single detail changed can change the whole hash, so you need to know the input exactly to have that right, or spend a lot of time, effort and power, just to determine one.
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#3295

  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? SHA-256 hashing algorithm is to brute-force because no matter how big or small your input is the output will always have a fixed 256-bits length.

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#3296

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

  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    It is unidirectional, each hash is unique and you could pretty much never figure out the original raw input from the output because of the intricate mathematical complexity involved in producing it.

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#3297
  1. SHA-256
  2. The computing power required to break a specific string of security is basically impossible 2^256
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#3298

  1. Hashing Algorithm used in Bitcoin is called SHA-256

  2. Hashing Algorithm is hard to brute-force because it is impossible to reverse and recalculate the output hash to its original state.

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#3299
  1. What is the hashing function algorithm called used in Bitcoin?

Secure hashing Algorithm - 256

  1. Why is this hashing algorithm really hard (almost impossible) to brute force?
    This one-way mechanism is guaranteed through intricate mathematical equations which do not allow the reversal of a new hash. Therefore, a Bitcoin hash is only solved in a linear, unidirectional manner.

It

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#3300
  1. SHA-256
  2. Because the hash function is non reversible due to the endless output possibilities
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#3301

  1. The hashing algorithm used in Bitcoin is called SHA-256.

  2. It is almost impossible to brute force this hashing algorithm as itā€™s a one way mechanism guaranteed through intricate mathematical equations which do not allow the hash to be reversed.

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#3302

  1. What is the hashing algorithm called used in Bitcoin?
    SHA256

  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    All source information is lost no computer existing today can work back this problem.

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#3303
  1. SHA-256

2.The algorithm is one-way mechanism, solved in a linear, unidirectional manner. The mathematical equations do not allow the reversal of a new hash. Only output. If the out put exceeds 256 characters, then a new input must be attempted.

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#3304

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

  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    Because its output results in a random number between 0 and 256 digits, in a one way mechanism ( you canā€™t reverse it to calculate the initial data)

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#3305

Question #1: What is the hashing algorithm called used in Bitcoin?

Bitcoin uses a hashing algorithm called SHA-256 or (Secure Hash Algorithm ā€“ 256 bit)

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

Due to the blockā€™s header being guessed through trial and error there are so many possibilities getting the correct hash requires very large amounts of computations and mathematical capacity from dedicated hardware and software to complete its PoW challenges.

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#3306
  1. Secure Hash Algorithm SHA - 256.
  2. Hash function used SHA 256 algorithm to produce hash value, this hash canā€™t give input when we traverse back. As it is irreversible itā€™s highly impossible to try with muliple imputs.
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#3307
  1. SHA-256
  2. The hashing algorithm has become really hard due to a number of reasons, some of which are to control the amount of blocks that are introduced into the blockchain. So a complex mathematical equation has to be solved and then like a lottery and also depending on the amount of hashrate, a computer solves a block.
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#3308

Has function has a fixed difficulty for being brute forced because it has a fixed number of outputs (2^256).
Mining though is not exactly the same as brute forcing; in mining, miners are searching for a new hash below a certain target while in brute forcing you are searching for a specific output of the hash function. :slight_smile:

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#3309

  1. SHA-256

  2. This hashing algorithm discourages attempts by hackers to guess bitcoin relevant outputs as it is much easier to just ā€œmineā€ the bitcoin hash outputs than to fraudulently steal it. This effectively secures the hash outputs due to the almost impossibility of ā€œguessingā€ a correct output that would be obtained legitimately through mining a coin or fraction thereof.

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#3310

1: SHA 256

2: Brute force would take a few lifetimes to complete the computations necessary figure it out.

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#3311
  1. SHA-256
  2. First, itā€™s not possible to get the input with output, this is an only-one way algorithm. Second, if the algorithm fails and gets a number above the target, the nonce (blockā€™s header) is incremented, which involves changing the hash and trying again.
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#3312

Mining is not the same as brute forcing; in mining, miners are searching for a new hash below a certain target while in brute forcing you are searching for a specific output of the hash function. :slight_smile:

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