Reading assignment: Hashing

Blockchain and Bitcoin 101
#202

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

  2. The SHA-256 hashing algorithm is difficult to brute-force because only random hash operations against test input, can be used to decipher a hash.

#203

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 hard to brute force because every input has a unique hash combined with a nonce

as well as there are 2^256 different possibilities.

#204

  1. SHA-256.

  2. The possibilities of finding the same output for the target hash would be endless, an astronomically high amount of attempts.

#205

  1. SHA 256

  2. The odds of finding the correct hash by Brute Force are so small as to make it extremely improbable to do so.

#206
  1. SHA256
  2. It’s infeasible because the given amount of possibilities is so high it would take forever by brute- force to guess the input from the output.
#207
  • What is the hashing algorithm called used in Bitcoin?
    SHA256
  • Why is this hashing algorithm really hard (almost impossible) to brute-force?
    2^256 possibilities
#208
  1. SHA-256
  2. The possibilities are massive and the odds of brute forcing are minuscule
#209
  1. Bitcoin uses the hashing algorithm SAH-256 (secure hashing algorithm 256).
  2. Brute force faces stupendously high odds of success, that it is considered infeasible to break pre image resistance.
#210

1.The algorithm used for hashing in Bitcoin is SHA256

2.The hashing algorithm is hard to brute-force because so much computing goes into developing a Hash, trying to Brut-force will be impossible. trying to find and input from just the output will be so time consuming it will be pointless.

#211

  1. SHA-256 (secure hashing algorithm)

  2. because there are ~2^256 posibilitys and it would take About 10 Lifetimes to brute-force

#212

A Hashing Algorithm is a way of getting a predetermined length of characters through the use of a specific formula. Ideally this Algorithm would have 3 laws.

  1. Deterministic - always getting the same output from the same input (consistent results)
  2. Quick Computation - The output is determined quickly for practicality
  3. Pre-Image Resistance - Can work backwards to figure out the input.

Bitcoin uses SHA256 Algorithm

(2)
With todays technology it would literally be nearly impossible to check every possible character combination and come up with an equal output and still be around when your computer finally figured it out. Way too many possibilities.

#213
  1. What is the hashing algorithm called used in Bitcoin?

Secure Hashing Algorithm 256 or simple SHA-256

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

This hashing algorithm produces a 256-bit hash it means in an average senario you need 1.7 X 10^38 times to make inputs which will maybe give you the has that you are looking for to break. So good luck :wink:

#214

[quote=“ivan, post:1, topic:8422”]

  • What is the hashing algorithm called used in Bitcoin? Secure Hashing Algorithm - 256 (SHA - 256)
  • Why is this hashing algorithm really hard (almost impossible) to brute-force?
    [/quote] The Brute Force method is essentially picking a random input then hash it, compare with the output target and repeat until a match is found. The odds of randomly finding it are astronomical, and at worst you’ll find the data after 2^128 or at the end of going through all the data. Average scenario - 2^128/2 = 2^127 = 1.7 x 10^38 times, a huge number that would take so long it wouldn’t matter.
#215

SHA-256

It is very difficult to break with 2^256 possible solutions.

#216
  1. What is the hashing algorithm called used in Bitcoin?

The Hashing algorythmn in Bitcoin is called SHA-256 or ‘Secure Hashing Algorythmn 256’.

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

The SHA-257 is really hard to brute force because it would take 10 lifetimes to break the code in this manner.

#217
  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 would take a very long time to find out the result.
#218

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?
Pre-image resistance creates a reality in which the favourable outcome for the attacker has
so extremely low odds of success, that the effort to perform the attack itself becomes meaningless.

#219

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 take too much computational power in order to try to mathematically reverse the hash to find out its unique input, making it infeasible, but not impossible, can say impossible because you must spend too much time/energy/power to at least even try.

#220
  1. SHA256
  2. It is infiseable to find A from a H(A) because of multitude of possibilities.
#221
  1. SHA-256
  2. Because it is mathematically proven that it takes ridiculously long time to guess what the input was by knowing the output.
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