Reading assignment: Hashing

Blockchain and Bitcoin 101
#3815

1.Secure Hash Algorithm named SHA - 256.

2.Because the amount of combinations that are allowed, it’s hard or almost impossible to reverse the output of the function to get back the input.

/ Viktor

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#3816
  1. SHA-256
  2. Once you have the hash, it´s like a mixture of ingredients you can not recognize.
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#3817

  1. SHA-256

  2. the hash function is irreversable

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#3818
  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?
    • Retrieving the original string of an unidirectional hash algorithm without any information on the original content, content length or private key to confirm exactitude, is more of a lotery game than something that can be achieved with effort as the amount of possibility is simply to high.

For simple guessable string computing power can be used but when the complexity of the initial string grow, the complexity grows exponentially.

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#3819
  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?

Since there is no way to reverse a hash, they are solved linearly. Each hash may generate a number with alphanumerical digits between 0 and 256. There are so many possibilities that brute force is not likely to perform better than the standard random result generation. In the case of Bitcoin, the difficulty of solving the algorithm is also increased over time, and adjusted based on effectiveness of mining equipment, making brute-forcing even more difficult.

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#3820
  1. What is the hashing algorithm called used in Bitcoin?

The algorithm that is used is known as SHA-256

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

Because the program outputs a hash that is 256 bits long, which is practically impossible to guess

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#3821

  1. SHA-256

  2. It is nearly impossible to brute force because it would require too many attempts.

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#3822
  1. SHA 256
  2. because every input number creates a different output, so it is very hard to reproduce
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#3823

Bitcoin’s Secure Hash Algorithm is called SHA-256

SHA-256, designed by the National Security Agency (NSA), is an irreversible one-way hashing function originally used for secure password hashing. In other words, a function that prevents the reversing of outputs to obtain the input value.

Brute-Force is a basic algorithm that solves problems by systematically enumerating all possible alternatives in order to find the best alternative to achieve a solution. Attackers utilize this algorithm in order to unlock passwords or other essential data that were hashed.

Bitcoin adopted SHA256 for transaction verifications which made mining rewards as difficult as winning the lottery. Technically, SHA256 is utilized as the Proof-Of-Work algorithm in mining and also improves security and privacy when utilized to create new addresses for bitcoin.

SHA256 is a one-way hashing function that can convert any data into a 256-bit hash value which is a 64 digits long hexadecimal number that consists of 10 numbers [0-9] and lower-case roman alphabet letters (a-f). Due to this feature Brute Force is merely impossible, thus irreversible:

Here’s an example:

image

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#3824

1.SHA 256
2. It is hard to use brute force because of the number of possibilities and the hashing is done at random and there is a specific hash rate that each block to be mined to maintain a specific and predictable supply of bitcoin.

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#3825
  1. SHA-256
  2. It is similar to the mixer analogy. It is not reversal. You go to make a salsa in the mixer you add in all the inputs and the output is different you cant redo the inputs. One way and can not be duplicated.
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#3826

SHA-256

The unidirectional process of the hash algorithm make it very difficult to determine the raw data input, only leaving the hash viewable.

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#3827

Bitcoin uses a uses a Secure Hash Algorithm (SHA) named SHA-256. (NSA).

SHA-256 is a one-way mechanism, unidirectional and can not be reversed to calculate the initial raw data.
The slightest change of raw data will produce a completely different output.

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#3828
  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?

The algorithm is tuned bi weekly to remain difficult and statistically rare to solve which results in it being very difficult to brute-force and thus the analogy is given to winning a lottery.

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#3829

Secure Hash Algorithm (SHA) named SHA-256.

The hashing algorithm is really hard to brute force because it requires an incredible amount of computations to solve (or hash). Also because every 2016 blocks it calculates the performance of miners and modifies the target to be more challenging if miners are solving it too quickly. It also requires dedicated hardware equipment to solve the equation and the article suggests a good hash rate is considered 14 TH/s.

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#3830

  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?
    It is virtually impossible to reconstruct the initial data from the hash value (the blender analogy).
    A brute force attack would need to make 2^256 attempts to generate the initial data. Second, having two messages with the same hash value (called a collision) is extremely unlikely.

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#3831

1.) SHA-256 Secure Hash Algorithm - 256

2.) The algorithm is extremely hard to brute force because it is incredibly complex and requires huge computations to be solved that get increasingly harder and harder. The algorithm is so difficult it requires hardware equipment dedicated to only solving these complex computations

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#3832
  1. Secured Hash Algorithm 256. (SHA-256)
  2. Its Blend of 256 numbers. Its complex matematical equation and require a lots of computing power to be solved. It cannot be reversed!
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#3833
  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?
    It is a one-way mechanism that cannot be reversed. This makes it nearly impossible to brute-force.
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#3834
  • What is the hashing algorithm called used in Bitcoin?

Bitcoin uses the secure hash algorithm otherwise known as SHA-256. This was created by the National Security Agency (NSA) of the United States.

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

To see why SHA-256 is hard to brute-force takes into consideration how mining bitcoin is done. This process is very much like a lottery because how the blocks are added depends on when a hash is successfully verified. Through the block’s header where the hash is less than or equal to the target, consider there are values between 0 and 256. With mining, the target is to go below it. However, hashing often goes above and the trial and error process continues until a hash is finally verified. This requires high computing power and lots of time. Therefore, once a hash is chained to a block, it cannot be changed.

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