Reading assignment: Hashing

Blockchain and Bitcoin 101
#142
  1. SHA 256
  2. The number of computational possibilities is extremely high with a 256 hash, to find inputs based on the output is near impossible.
#143
  1. SHA256
  2. The hashing algorithm SHA256 is difficut to brute-force because there is huge amount possibilities to be guessed what will take a huge amount of time.
#144

  1. What is the hashing algorithm called used in Bitcoin?
    Sha256

  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    Although technically not impossible, it is almost impossible to reverse image using brute-force due to the probability and length of time it would take to determine the answer. The length of time would be so long and the probability so low that it can be considered essentially almost impossible.

#145
  1. sha-256
  2. it would take so much time that it is practically impossible.
#146

1.What is the hashing algorithm called used in Bitcoin?
Secure Hash Algorithm (SHA) 256

2.Why is this hashing algorithm really hard (almost impossible) to brute-force?
Without knowing the input that can arrive to the hash output is near impossible to compute with current computer power. You’ll still find it after forever and a day. The pre-image resistance is at work here.

#147

1.SHA 256

2.because its extremly complicated puzzle to solve, but very easy to see if its in error

#148
  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 of its puzzle friendliness. An extremely large scale, random approach brute force would be required due to the large number of possible inputs to match the hash. 2^256 different possibilities to append to the hash of a block.
#149

1- SHA-256
2- Its infeasible to find A given H(A). If any chance on the input gives a very different output, one would have to pick a random input countless times and compare to the output

#150
  1. What is the hashing algorithm called used in Bitcoin?
  • Bitcoin uses SHA-256
  1. Why is this hashing algorithm really hard (almost impossible) to brute-force?
  • The hashing algorithm is almost impossible to break due to the unlikely fact that two individuals get the same result in their life time. Besides it takes way too long so it doesn’t matter
#151
  1. SHA-256
  2. It will take a very very very long time to to find a matching by comparing inputs
#152

1 Sha256
2 With every key stroke changing the hash code it is not feasible to attempt to decipher as the time it takes would be to long to prove worth it.

#153
  1. “Secure Hashing Algorithm 256” or “SHA-256”
  2. Because of the puzzle friendliness property and the “high min-entropy” involved in it.
#154
  1. SHA 256
  2. Due to the 26 hash, the number possibilities are extremely high and therefore making brute forcing a mute point.
#155
  1. It is called SHA-256
  2. The number of possibilities to guess the input of one hashing output is so large (2^256) that it is infeasible to do it.
#156

  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 would take very long to try every possibility and randomly find a collision

#157
  1. Hashing is the process of taking an input of any length and returning an output of a fixed length. the algorithm bitcoin uses is called SHA-256 (Secure Hashing Algorithm 256). 256 being its fixed bits length.

2)It would take multiple lifetimes to hack the code as would have to use brute force which is guessing ever possible variation. this is made harder because no matter how big/small your input is, the output will always have a fixed 256 bit lengths

#158

  1. SHA-256

  2. Because there is only one correct answer and a gazillion options

#159
  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?
    If we randomly pick up an input and hash it, probabilities that we are getting the expected results would take so long that it does not matter.
#160
  1. The Bitcoin hashing algorithm is SHA-256
  2. The hashing algorithm is almost impossible to brute-force because the inputs are pre-image resistant. When using a 128 bite hash it makes it unfeasible to brute force.
#161

SHA-256
The data is too large and to get matching sets is very difficult. If you get different hashes every time, it will be infeasible (not impossible). Pure random guesses, you’d be guessing for the rest of your life.