Reading assignment: Hashing

Blockchain and Bitcoin 101
#162

  1. Bitcoin uses SHA 256 hashing algorithm

  2. It is really hard because you have to pick up random input, hash it and compare the output with a target hash and repeat until you find a match. The chances of this happening is very unlikely to impossible.

#163
  1. it’s called SHAR 256
  2. Impossible because one single input gives one single output, and the slightest modification on the input will automatically change the output.
#164

  1. SHA256 (Secure Hash Algorithm 256)

  2. Brute force attacks work by running through a list of possible input variables 1 by 1. Given the sheer number of possibilities are so large a Brute force attack couldn’t be achieved in a viable timeframe.

#165

Bitcoins hashing algorithm is called SHA 256
Because it adds a number so big to the data that you have to figure out perfectly in order to get access to the data. Next to impossible.

#166
  1. SHA 256
  2. It takes forever to get a right string for an hash and there is no clue to guess the similar hash and string.
#167

[SHA-256]

I would take an infeasible ammount of time to brute force,

1 Like
#168
  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? The number of option is just astronomical.
#169

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

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

Hashing algoritem used in Bitcoin is sha-256 ( secure hashing algorithm 256.)

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

Because blockchain is a linked list With data. A hash pointer that Points to a previus Block. A hash pointer is simmilar to a pointer, but instead of containing the adress of the previous Block it also contains the hash of date inside the previous Block. If a hacker tries to change one, the others will also change. The number of possabilities is so large that is unlikly that two People get the same result in their Lifetime.

#170

  1. SHA-256

  2. SHA 256 hashing algorithm is hard to brute force because a random input has to be hashed to get an output that matches the original output. That takes a very long time.

#171

  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 so many inputs to try, that it is almost impossible to find it and it would take to long to find it.

#172

What is the hashing algorithm called used in Bitcoin?

Bitcoin uses SHA 256, or “Safe Hashing Algorithm 256”.

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

The average times you would have to manually brute force check for the hidden variable is 2^255 times, which is an astronomical number of times.

#173
  1. SHA-256
  2. because with currently existing computer capacity and efficiency, it would cost impractical too much money and would take impractical too much time to brute force. The chances of getting a lucky collision are also too small
#174

  1. SHA 256. Secure Hashing Algorithm. Output of a fixed length.

  2. Because it would take too much time to so, it would take more a than your own life to to brute force.

#175

What is the hashing algorithm called used in Bitcoin?
Sha256

Why is this hashing algorithm really hard (almost impossible) to brute-force?
Because matching its specific encrypted data is almost impossible

#176
  1. What is the hashing algorithm called used in Bitcoin?

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

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

Because to brute force a hash generated with SHA-256, you must try in the w orst case 2^256 combinations, or 2^256/2 = 2^255 in average, which is a huge amount of combinations which is not impossible, but unfeasible (it would require supercomputers of enormous power and a lot of time).

#177
  1. What is the hashing algorithm called used in Bitcoin?
    Its called sha256
  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?

Because the sha256 has 2^256 different possible results. Which is a huge number. Since small changes to the input changes the hash completely you will always only have a 1 divided by 2^56 chance of getting the right hash every time you make a guess. So you need to guess an insane amount of times to get the hash result you are looking for.

#178

  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?
    The hashing function is one-directional. So that you can compute the hash easily, but there is no way to compute the data from the given hash. In order to solve this, the most effective strategy is to randomly guess numbers.

#179
  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 will have to spend a very long time trying to find a match.
#180
  1. Sha 256
  2. Because of the characteristics of cryptographic hash functions. Small changes in the input (like a case letter) change the hashed output completely, making it unfeasible, not impossible, to brute-force the input from a given output.
#181

SHA-256
Would really take a long time to find a collision, their are to many possibilities. Practically impossible though possible to find 2 inputs to produce the same output in a hash function.