Reading assignment: Hashing

Blockchain and Bitcoin 101
#1750
  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 infeasible because the number of computational possibilities are so high that it would take a very long time to find the answer.
1 Like
#1751

The hashing algorithm used in Bitcoin is called SHA-256.

Brute-force is a process of elimination using random guesses with an extremely low probability of guessing correctly in a realistic time frame due to the number of hash functions used in the SHA-256 algorithm.

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#1752
  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? There are way too many computational possibilities
1 Like
#1753

  1. SHA-256 and ECDSA

  2. A brute-force attack would take multiple lifetimes.

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#1754

ECDSA is the elliptic curve used to derive public keys :slight_smile:

1 Like
#1755
  1. Sha-256
    2.It’s nearly impossible to brute force because of the properties “crypto-graphic” hash functions which includes 5 immutable properties. They are 1) deterministic, 2)quick computation 3)preimage resistance 4)smalls changes in the input changes the entire hash 5)collision resistance
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#1756 
    What is the hashing algorithm called used in Bitcoin?
        SHA-256

    Why is this hashing algorithm really hard (almost impossible) to brute-force?
     The # of combinations that can be the output of a SHA-256 hash are just too astronomically high for a brute force attack (or collision) to be extremely infeasable.
1 Like
#1757

1 - SHA-256

2 - because any input data will always result in a 256 bit string after being hashed, and doing it in reverse is infeasible because it will take a lot of time without any guarantee in the result because the possibilties are vastly increased in this hashing method

1 Like
#1758

  1. What is the hashing algorithm called used in Bitcoin?
    Bitcoin uses hashing algorithm SHA-256

  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    Brute force is infeasible as the computational possibilities with a 256 hash is to high and time consuming

1 Like
#1759
  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 you have to randomly pick a number between 1 and a bazillion~ and it’ll take you so long to guest that it’s not worth trying.

With that said, if one were to keep going and guested the number after years of trying, wouldn’t that block be mined a long time ago and it wouldn’t matter right? Wouldn’t someone have to guest the hash number within 10 minutes to crack the block?

1 Like
#1760

Reading assignment: Hashing

  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?

Would be to essentially guess an incredibly long number.

1 Like
#1761
  1. sha-256
    2.The amount of computational possibilities is so high that it would make it not feasable
1 Like
#1762

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

  2. This Algorithm is almost impossible to brute-force because it would take a massive amount of time and energy which would be a futile attempt.

1 Like
#1763

Mining isn’t really brute forcing (kind of). Miners are trying to find a new hash from the data whose value is below a certain threshold. Brute forcing a hash would mean you want to find the same already existing hash from the unknown input. :slight_smile:

2 Likes
#1764

  1. SHA256

  2. Because it will take a very long time to do it.

1 Like
#1765

1- SHA 256

2- The number of possibilities is so high it would be a waste of time to attemp a brute force attack.

1 Like
#1766
  1. SHA 256 is the hashing algorithm used in Bitcoin.
  2. SHA 256 is really hard (almost impossible) to brute force because the original input is almost untraceable from the output, you would either have to be extremely lucky (struck by lightning) to find/guess the input, or unlucky to die before you guess the input among all the variables of the hash function. SHA 256 is Immutable.
1 Like
#1767

  1. Secure Hashing Algorithm 256 or SHA 256

  2. You are picking a input out of space and working it through a function then comparing the end result with the answer you are trying to find. The amount of variables that one would have to try is longer than many life times.

1 Like
#1768

  1. SHA-256

  2. In order for a cryptographic hash function to be sufficiently secure for use in cryptography, it must have certain properties. One of those properties is Pre-Image Resistance. If a cryptographic hash function is Pre-Image Resistant, hashing the algorithm by trial and error (brute force) comparison will be so difficult that it is virtually impossible.

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#1769

1. Bitcoin uses SHA-256.
2. The use of brute-force is nearly impossible because of the amount of time it would take to guess correctly.

1 Like