Reading assignment: Hashing

Blockchain and Bitcoin 101
#3253

The difficulty for brute forcing a hash function is fixed. If you want to increase the difficulty to break the hash function you should change the algo or increase the size of the output from 256 bits (which would technically also be a new hash function and would not be SHA256 anymore)
The difficulty in mining changes by setting a different threshold for acceptable outputs of said hash function, not changing the function itself. :slight_smile:

#3254
  1. SHA 256
  2. It would be like reconstituting a blended puree back into its original food structures.
1 Like
#3255
  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?
  • 256-bit encryption
  • The hash algorithms can only be solved to find the ultimate hash output and can’t be reversed to calculate the initial raw data.
  • The one-way mechanism does not allow the reversal of a new hash. Bitcoin hash is only solved in a linear, unidirectional manner
1 Like
#3256
  1. The hashing algorithm is called SHA-256.
  2. it is protected by the network’s sheer scale and the difficulty adjustment in the core software. Hashing functions are also a one-way transaction. Even if all the parts of the input are there, it is impossible to reverse it.
1 Like
#3257

  1. The hashing algorithm for bitcoin is called SHA-256.

  2. This hashing algorithm is really hard (almost impossible) to brute force because it can only be solved in a linear, unidirectional manner and can not be reversed.

1 Like
#3258

  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?
    Bitcoin hash is only solved in a linear, unidirectional manner

1 Like
#3259
  1. SHA 256
  2. By its mathematical nature, In a hash function is almost impossible to find 2 imputs that generates the same output, computationally would take that long a hundreds and a hundreds of years…
1 Like
#3260
  1. SHA-256
  2. Every input leads to a different output. Therefore, no hash can be compared with another one so it’s nearly impossible to guess the input as this would take an awful lot of time.
1 Like
#3261

1)SHA-256
2)Because it is almost impossible to get same inputs

1 Like
#3262

  1. SHA256 (Secure Hash Algorithm 256)

  2. Every single unique input, accurate to even a space, comma or dot will create an associated output. With just the output, it is near impossible to source the initial input.

1 Like
#3263
  1. SHA - 256
  2. Because of one way method, It is impossible to find the input value from the output.
2 Likes
#3264

  1. SHA 256

  2. Since the hash algorithm is constantly being fed different data which results in different outputs, and the unidirectional feature on top of that makes it nearly impossible to compromise.

2 Likes
#3265
  1. SHA-256
  2. computing power for brute force is not at all manageable with current technology - and the output is not reversible to the input.
2 Likes
#3266
  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 the algorithm only outputs to an ultimate hash and cannot be reverse calculated to get original raw data. Essentially one way traffic.
1 Like
#3267
  1. SHA-256
  2. It is a linear and unidirectional system. It cannot be brute forced due to the large amount of computational power required to do so, also because it is random like winning the lottery.
1 Like
#3268
  1. SHA-256
  2. Due to the fact that there are so many combinations of characters possible that generates a hash that checking them all one by one (brute force) will take ages or insane luck
1 Like
#3269
  1. SHA-256

2.It has a zero to 256 digit function that produces a different output with every input making it impossible to duplicate

1 Like
#3270
  1. SHA-256
  2. it takes way too long to solve
1 Like
#3271
  • What is the hashing algorithm called used in Bitcoin?
    SHA256
  • Why is this hashing algorithm really hard (almost impossible) to brute-force?
    Because a brute force attacker would have to try every possible input string of every possible length in order to be guaranteed of reverse engineering the hash results.
1 Like
#3272
  1. What is the hashing algorithm called used in Bitcoin?

Bitcoin uses the Secure Hash Algorithm 256 (SHA256), developed by the NSA.

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

The SAH works in a “one-way-direction”. This means, that the output HASH cannot be “reverse engineered” easily, because the underlying function encrypts the input in a way that, at least with today’s computing power, there is no easy way to find out what the input was. Also note that, if the exact same input would be put into the algorithm, of course, it would output the exact same HASH. But if only the slightest change in input happens, even if it’s just a comma, the output HASH would be entirely different, so that “guessing” the input to reverse engineer the HASH, becomes impossible.

1 Like