Reading assignment: Hashing

Blockchain and Bitcoin 101
#3895

1: SHA 256
2. its mathematical impossible

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#3896
  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?
  • In the process of hashing there is ā€œinformation lossā€, so there is no algorithmic way to find the input of the function. The attempt to ā€œbrute-forceā€ it is impractical. It will simply take too much time. It is possible however to come up with two different inputs that arrive at the same hashing output :wink:
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#3897
  1. What is the hashing algorithm called used in Bitcoin?

Bitcoin uses a hash algorithm called SHA-256 which was created by NSA.

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

Hashing algorithms are mathematical equations that are not reversible, therefore they cannot be used as a digital fingerprint. Data can be altered by a space or comma and if you input the same data you will get the same result.

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#3898
  1. What is the hashing algorithm called used in Bitcoin?

Secure Hash Algorithm (SHA) named SHA-256

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

Mining is similar to a lottery since the goal is to generate a hash with a value that is below the target and in many cases the generated value is above the target, regardless of how much work is put in.

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#3899

It is called SHA-256.

Generating a hash that is 256 bits long that will corresponds to the output will be impossible based on the many possibilities involved.

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#3900

  1. SHA256

  2. Because there are too many possibilities.

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#3901
  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 itā€™s a one way method, canā€™t be reversed or duplicated.
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#3902

Sha 256

It is impossible to reverse

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#3903

  1. Sha-256

  2. All transactions are irreversible and encryption will take forever to crack, using regular computing methods. It might be possible to crack, using a quantum computer, leaving bitcoin the blockchain vulnerable to quantum attacks in the future.

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#3904

1: SHA:256 is the hashing algorithm.

2:Because of the POW: Proof Of Work as it is almost like a lottery.

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#3905
  1. What is the hashing algorithm called used in Bitcoin?
    Secure Hash Algorithm referred to as SHA-256
  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    Because in order to brute-force the hashtag algorithm the process of solving it in such a way is done entirely by random and the total number of possibilities is so large that it might take an entire lifetime to replicate
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#3906
  1. SHA-256
  2. The Algor. cannot be backfilled and is based on Zero to 256 the time to match or duplicate it would be so long if not impossible to create (re-create).
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#3907
  1. SHA-256 hashing algorithm
  2. Single direction , hard to decode original data
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#3908

1. What is the hashing algorithm called used in Bitcoin?
1.A. SHA256 referring to the amount of bits (256) used in encryption.

2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
2.A. Using elliptic curve cryptography, the hashing algorithm is a linear, unidirectional coding using 256 bits of alpha numeric encryption, much like a 256 bit password. Brute-force relies mostly on known words and names to decipher.

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#3909

To brute force would require an almost infinite number of guesses (which would require a very long time.

#3910

  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?In order to brute force the algorithm will require an almost infinite number of trials, which would frequire a very long time.

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#3911

Elliptic curve cryptography is used to derive public keys, not to hash data, for that SHA256 is mostly used, but there are others as well.
Using common words wouldnā€™t help much in brute forcing tx data, but is commonly used to crack passwords. This is not brute forcing because brute force is basically trying random combinations until you get the correct output. While with common words you already have a list that you use which decreases the number of tries you require to get crack the passwords, given people use these common words for their passwords. :slight_smile:

#3912
  1. SHA-256
  2. Each possible header produces a unique hash function output, which acts as a random number generator. Therefore, it is not possible to ā€œzero inā€ on the answer. Any change in the nonce is just as likely to meet the target as any other change.
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#3913
  1. Bitcoin uses the hashing algorithm SHA-256 which was developed by the National Security Agency
  2. Each algorithm produces a unique hash that can be altered by a single comma, and the math is one way and linear, so it cannot be reversed (similar to finding out the ingredients in a smoothie by looking at it)
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#3914

  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?
    Its near impossible because the hash consists of letters and numbers that will never be used again once used in a particular order.

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