Reading assignment: Hashing

Blockchain and Bitcoin 101
#2852

Thank you for the welcome message

#2853

A) Sha 256
A) mathmatically almost impossible

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#2854

What is the hashing algorithm called used in Bitcoin?
SHA256

Why is this hashing algorithm really hard (almost impossible) to brute-force?
Due to the number of computational possibilities of using SHA256 the time required would be far longer than the 10 minutes before the next block was produced. You’d have to have some extreme good luck to get the hash first time… or maybe a time machine to get a super computer from the future.

3 Likes
#2855
  1. SHA-256
  2. SHA-256 is meant to be a one way algorithm which after producing it’s output is next to impossible (really really impractical and time consuming) to reverse.
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#2856
  1. Secure Hashing Algorithm-256
  2. There is a lot of data: In an average scenario, you need to do approximately 2^256/2 = 2^128 (340 undecillions…) computations to find the hash.
2 Likes
#2857
  1. SHA-256
  2. with a 256 bits long hash, there are 2^256 or 1.15E77 possible combinations, such a large amount of possibilities that even the fastest software+hardware cannot try them all in a reasonable amount of time.
3 Likes
#2858

Answers to the Hashing questions.

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

  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    It’s almost impossible because it would have to enter exactly the same input from mass of possibilities to get the same hash output.

1 Like
#2859
  1. What is the hashing algorithm called used in Bitcoin?
    SECURE HASH Algorithm created by NSA
  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    Because thd smallest change in input changes output completely.
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#2860
  1. The hashing algorithm used is called SHA-256.
  2. It takes a possible total of 2^256 guesses to “crack” a key …
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#2861

1 : Bitcoin uses a hashing algorithm called (SHA) named SHA-256.

2: The hashing algorithm is hard to brute force since it is flowing in one highly complex output mathematical direction. Therefore difficult to imput due to high math combinations to match the hashing function going on.

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#2862
  1. SHA 256
  2. Because once input goes through the algorithm to become the output, it is nearly impossible to figure out what the original input data was.
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#2863

  1. SHA-256

  2. the # of potential outcomes is so large, the likelihood of achieving the same output are astronomical.

1 Like
#2864
  • What is the hashing algorithm called used in Bitcoin?
    SHA-256
  • Why is this hashing algorithm really hard (almost impossible) to brute-force?
    Because the hashing algorithm is only unidirectional and cannot be calculated in the reverse to find the initial raw data
1 Like
#2865
  1. SHA-256
  2. The hash function get more difficult to solve with each block height. The longer the chain continues, the lower the target and the increased difficulty
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#2866
  1. SHA-256
  2. Because you would have to find the input of the function based on the output, the possibilities are too many for a human to find it on a lifetime.
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#2867

Hash functions have nothing to do with block height or difficulty. PoW utilizes hash functions to work. The reason why hash functions are difficult to brute force is because of the sheer number of possible outputs. :slight_smile:

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#2868
  1. SHA-256
  2. It is impractical and technically difficult because the probability of solving the algorithm is infinitesimally low.
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#2869
  1. SHA-256 (Secure Hash Algorithm).
  2. Hash algorithm is linear one direction and makes this almost impossible to force.
1 Like
#2870

  1. What is the hashing algorithm called used in Bitcoin?
    It’s called a Universal Translator.

  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    It’s impossible to brute-force because it takes the data and compiles it down into 64-Bit, 128-Bit, or 256-Bit Alphanumeric string which cannot be reversed search.

1 Like
#2871

Not sure what you mean by that. The hashing algorithm is called SHA256. :slight_smile:

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