Reading assignment: Hashing

Blockchain and Bitcoin 101
#3113
  1. SHA 256
  2. This function is too difficult to solve with Brute Force as it has 256 possibilities in order to crack the desired output.
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#3114

  1. SHA-256

  2. This hashing algorithm is hard to brute-force because it is almost impossible to reconstruct the initial data from the hash value. A brute-force would need to make 2^256 attempts to generate the initial data which could take a super computer centuries, therefore almost impossible.

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#3115
  1. Secure Hash Algorithm, SHA-256
  2. A BTC hash is solved in a linear, unidirectional method, and is not reversible.

I could not get the link to open up for the required reading, but I found this article which was pretty interesting

Bitcoin Hash Functions Explained Simply !! (themoneymongers.com)

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#3116

  1. The hash algorithm is called SHA-256

  2. The algorithm involved cannot be reverse engineered to find the original input. The initial raw data cannot be determined because of the raw number of possibilities.

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#3117

1. Bitcoin uses Secured Hash Algorithm (SHA-256)

2. Bitcoin uses SHA-256 which is infeasible to brute-force, as brute-force simply means picking a random input to hash then compared to the given hash.
there are different scenarios for brute-force method;
In the worst case scenario: it would be after (2^256)-1 random inputs to hash then comparing it to the given hash.
Best case scenario: is having it on the first trial, which you will need to be astronomically lucky.

Average case scenario: is when you find the correct input somewhere in the middle which means after half of the trails which can be represented as (2^256)/2=2^255 trails.

finding the input of the hash would be tremendously time consuming hence brute-force method is infeasible but not impossible.

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#3118
  1. SHA-256
  2. To be able to brute-force the algorithm, we need to find the input but it is almost impossible as we will be trying to find it through 2^128 options.
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#3119

SHA-256 Secure hash alghoritm invented by NSA within USA

hashing alghoritm process this a linear and undirectional process. each input creates a unique hash (output). the function can be solved only in a linear matter to find the output the hash cannot be reversed to the initial data.
its actually a digital fingerprint!

am i right? or there something to add? i would happy to hear some notices and comments about my answers :innocent:

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#3120

  1. Secure Hash Algorithm : SHA-256

  2. The output is always a 256-bit solution, almost impossible to solve.
    The algorithm works only in a one way direction, what means that you cannot go backwards from
    output to input to determine the original source data.

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#3121
  1. Bitcoin’s hashing algorith is callled the SHA 256 and made by NSA.
  2. It provides so many combinations, that it becomes extremly difficult to reverse the output of the function, which makes it secure.
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#3122
  1. Hash Algorithm SHA-256
  2. It almost impossible to solve if possible it takes so long to do it becomes almost unlikely
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#3123
  • The hashing algorithm is called SHA-256
  • This algorithm is virtually impossible to break as each hash provides a random number between zero and a maximum 256 digit value.
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#3124
  1. The BTC algorithm is SHA-256.
  2. It is nearly impossible to “brute force” the algorithm because it is a one-way, linear algorithm that cannot be reversed.
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#3125
  1. SHA 256
  2. works maybe with quantum computing
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#3126

SHA256

Nearly impossible to before force because it’s solved in a linear unidirectional manner and include 256 characters.

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#3127

SHA-256

The algorithms can not be reversed to calculate the initial raw data.

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#3128
  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 design as a one way mechanism where the hash algorithm doesn’t allow reversal of flow.
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#3129
  1. SHA-256
  2. Hashing algorithms can only be solved in a linear manner. Any data received in hash algorithm can’t be reversed, removed or edited…
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#3130

  1. SHA-256 (Secure Hashing Algorithm)

  2. If the Hash value is above the required target value, then the mining software will have to change the hash and try again. One block is created every 10mins. After every 2016 blocks the the mining clients compare their performance to the time avg set at 2 weeks. The target is then modified accordingly, making the mining (PoW) equation more or less difficult to solve.

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#3131 
  1 What is the hashing algorithm called used in Bitcoin?

It is called the SHA-256 algorithm.

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

This ashing algorithm is almost impossible to brute-force because it pretty much functions as a lottery. Computers trying to solve the algorith must insert random numbers to try solving the hash functions. The possibilities are enormous, the target number acting as solution to the function is between 0 and 256, and to solve the hash function it is needed to have a solution equal or lower than the target number. Each time the solution is superior to the target number, the cumputer must restart the hash which resets the function and provides a different result. Plus, bitcoin mining is expressively made to be hard to solve out. Usually, one block is created every 10 minutes. After 2016 blocks are created, the performance based on time is compared to the average two weeks that is usually needed. The pourcentage difference is applyed to reduce or augment the target number, wich makes it harder or easier to solve.

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#3132

1 Secure Hash Algorithm (SHA) named SHA-256.

2 Very low success probability in a very long time, in the current state of the computing power of our computers.

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