Reading assignment: Hashing

Blockchain and Bitcoin 101
#3535
  1. What is the hashing algorithm called used in Bitcoin?
    -> The hashing algorithm used is called SHA-256
  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    -> The algorithm produces a unique output string based on the input that is given, no two inputs produce the same output. A single change (a comma or a letter etc.) will change the output hash completely. In a brute force attack, the attacker is trying to provide various combinations of inputs to match the output, this becomes an impossible task due to the characteristic of SHA-256 described above.
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#3536

  1. What is the hashing algorithm called used in Bitcoin?
    The algorithm is called SHA-256 (secure hash algorithm)

  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    You can’t reverse the calculation and get the initial raw data. And every single change in the hash algorithm would change the output.

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#3537

IVAN ON TECH

HASH FUNCTION

2/25/2021

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

SHA-56

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

Because has algorithm are only derived using sophisticated mathematic equations, and once derived, it cannot be reversed, changed, erased and all blocks are verified before they get added to the blockchain. Can only get one output and any change will give a different result.

Gina

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#3538

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

    The hashing algorithm is called SHA-256.

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

    The hashing algorithm is only solved in a linear, unidirectional manner, due to intricate mathematical equations which do not allow the reversal of a new hash.

    For a clearer picture, think of a blender.

  • Before it’s on, the ingredients are distinct and easily identifiable (hash algorithm)

  • After it’s on, the ingredients are the same but impossible to reconstruct (hash)

    As a result, the hash can never be used or treated as any form of digital fingerprint of the data from where it was originally processed.

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#3539

  1. Hash algorithm of bitcoins is used to call Secure Hash Algorithm named SHA-256 ( cuz it runs on 256 bit )

  2. Because if you change anything in input the output will be always different, and it would take years to find the correct output by brute forcing the input for SHA-256

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#3540

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

  2. The hashing algorithm is really hard to brute-force because to find the input based on the output is impossible. There are so many combinations of numbers it would take someone more than a lifetime’s worth of attempts.

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#3541

  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?
    Because it has one way(linear) algorithm. You can only verify result if it is correct.

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#3542

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

A1 - A hashing algorithm (SHA-256 - Secure Hash Algorithm) uses a hash function to translate data into an alphanumeric string called a hash.

2 - Why is this hashing algorithm really hard (almost impossible) of brute force?

A2 - Hash cryptography is unidirectional and linear using intricate mathematical equations. Decoding a hash to alter a data would require a computational effort, disregarding quantum computing, impossible to solve, even more considering that each block is formed every 10 minutes.

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#3543

Answer the questions below.

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

-Bitcoin uses a Secure Hash Algorithm called SHA-256

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

-The sheer amount of time and computational power needed would render any brute-force attempts infeasible/impractical.

2 Likes
#3544
  1. Sha 256
  2. There are 256 characters that are randomized to create bitcoins hash. Also a hash can only be produced in one direction making it impossible to unscramble into its original sequence.
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#3545

1- SHA 256

2-SHA 256 is a linear and unidirectional algorithm and can not be reversed.

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#3546
  1. What is the hashing algorithm called used in Bitcoin?
    Bitcoin use SHA-256
  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    Bitcoin is using SHA-256 and only solved in a linear and unidirectional manner.
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#3547

The secure hash algorithm SHA-256 (256bit).

This is almost impossible to solve because SHA-256 is a one- way method

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#3548
  1. What is the hashing algorithm called used in Bitcoin?

The hashing algorithm is called SHA - 256.

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

It is almost impossible to brute force the hashing algorithm because it is almost impossible to guess the almost infinite number of potential combinations that could be have been used as the input.

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#3549

  1. SHA-256

  2. It hard because it would take an extreme amount of time and computerpower

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#3550

  1. SHA-256

  2. It is impossible to reverse to its original.

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#3551

  1. SHA-256 algorithm

  2. The algorithm works in a linear, unidirectional manner. Deriving the input from the output would be a trial/error process requiring a lot of computational power which makes any attempt unfeasible

I read the article several times and also searched other materials for this algorithm but I couldn’t quite get the concept of “incrementing the nonce”…This is what I understood: a miner is taking a transaction from the pool, takes it to a block and constructs a block header which is the information to be hashed (the input data for the transaction). If the hash (the output) doesn’t meet the certain threshold to “win the lottery”, the miner needs to try again until they succeed but they need to increment the nonce? The nonce is the value that changes with every attempt (while the block header remains the same obviously) but where are these different nonce values coming from?

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#3552

  1. SHA-256

  2. SHA-256 produces a hash that has 2^256 possibilities and is unidirectional, thus, making it mathematically impossible to brute-force and solve for the original input.

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#3553

[quote=“ivan, post:1, topic:8422, full:true”]
Answer the questions below.

  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 it is a one way function, cannot find the input from the output and the change of having the same output from different input is almost 0.

1 Like
#3554

  1. The hash algorithm used in bitcoin is called Secure Hash Algorithm.

  2. The hashing algorithm is really hard (almost impossible) to brute force because each hash algorithm has its unique features derived from certain data that, once computed and created, can never be be dissected to come up with the original data input. Similar to an analogy of blending food in a food processor. You have certain ingredients once blended you can not reverse the process and retrieve the original ingredients. However if you put the same ingredients in and process or blend a new batch, you can replicate the outcome or unique hash algorithm.

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