Reading assignment: Hashing

[d0nbxx]

1. The hashing algorithm that Bitcoin uses is Secure Hash Algorithm 256, or SHA-256
2. It is hard to brute-force SHA-256 because each hash is a random number between 0 and 256.
   In order to mine a block, the mining software needs to hash the block’s header in order to get it to be equal or less than a target which is a 256-bit alphanumeric code, shared by all BTC clients. This process is unlikely because the resources needed to perform an attack as such, due to the implementation of the incentive of BTC, the resources needed to perform such an attack would be outweighed if those resources were used as intended - for mining the finite supply of BTC (which has currently still not been reached). It stands at 18.7 million out of the 21M cap. [as of May 8th, 2021]

[DavidC]

1. What is the hashing algorithm called used in Bitcoin? The hashing algorithm used in Bitcoin is called Secure Hash Algorithm 256 (SHA-256).
2. Why is this hashing algorithm really hard (almost impossible) to brute-force? SHA-256 is almost impossible to brute-force because it is a one-way hashing algorithm that does not allow the reversal of a new hash. As the article explained, it is not possible to separate a tomato, a cucumber, and an avacado once they have been blended together. The same is true with a one-way hashing algorithm.

[MarL]

1. SHA-256
2. because a hashing function can’t be reversed

[2stroke]

1. Q: What is the hashing algorithm called used in Bitcoin?
   A: SHA-256

2. Q: Why is this hashing algorithm really hard (almost impossible) to brute-force?
   A: As there can be 2^256 possible combinations (according to a search online that’s more than the total grains of sand in the world, which if true is just mind blowing) of 64 string hash outputs, it’s nigh on impossible to crack this output, so pretty much impossible to reverse.

[michael356]

1.SHA-256
2.the output of hash algorithms is oneway linear,If, however, you were to feed the Bitcoin hash algorithm exactly the same data, it will produce the exact same hash. Change even the slightest comma or space, and the hash output will be completely different.

[akash-thyagaraja]

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?

It is nearly impossible to reverse engineer an input from an output as its a 1-way system with 2^256 different possibilities to guess at, which is some sort of incomprehensible number. The number of possibilities for the outcome is so immense it is extremely unlikely for 2 people to ever come to the same conclusion.

[spunkyredgirl]

1. (Secure Hash Algorithm) SHA-256

2. It’s a one way street with too many possibilities. The output cannot be reversed to figure out the original input.

[SEKLOF69]

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

SHA-256 - secure hash algorithm -created by the national securtiy agency within the USA

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

dont really understand this terminolgy in this context but
in terms of security the chances of being able to get the correct mathematical outcome are so vast its an impossiblity

would prefer all the reading bits for all courses to be avaialabe in a pdf for future reference please

[Alex9230]

1. What is the hashing algorithm called used in Bitcoin?
   SHA-256 - developed by the NSA
2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
   Cannot be reversed to discover the original input.

[Hamilton]

1. SHA- 256

2. becuase it has a number from 0 to 256

[Vincent20]

1. What is the hashing algorithm called used in Bitcoin? It’s called SHA-256.
2. Why is this hashing algorithm really hard (almost impossible) to brute-force? Each hash provides a random number between zero and a max 256 digit value. The algorithms can only be solved to find the ultimate hash output and can not be reversed to calculate the initial raw data. This makes a Bitcoin has only solvable in a liner unidirectional manner.

[Bob1]

1. The hashing algorithm in Bitcoin is called SHA-256.
2. This hashing algorithm is really hard to brute-force because these Hash s can be only solved from the output of the previus hash. So this one-way mechanism do not allow the reversal of a new hash.

[BallzOfCheeze]

1. SHA-256

2. Because it’s a oneway mathematical function (with current technology, brute forcing would take way to long)

[axiakles]

1. Secure Hash Algorithm (SHA) - 256
2. This cannot be reverse engineered because of the 2^256 possibilities

[dustwise]

1. SHA-256
2. It’s designed to scale in difficulty (work) based on the amount of participants. The sheer amount of possible outputs and the small window of answers which are accepted result in the difficulty.

[CBlock9]

1. Bitcoins hashing algorithm is called SHA-256

2. The hashing algorithm is really hard to brute-force because SHA-256 is a unidirectional not allowing for calculations to be reversed. Also, due to competition in the increasing amount of miners and the ever modifying PoW equation it becomes a trial and error process to get below or equal to the randomly generated hash number, requiring high amounts of computational capacity and equipment.

[Lexalrod]

1.). Secure Hash Algorithm (SHA)

2.) It’s almost impossible to reverse and the amount of computations are so large.

[D_V]

1. The Bitcoin hashing algorithm is called SHA-256 (Secure Hash Algorithm).

2. It is difficult to brute force because you would have to try each combination of a 256 character long string. The possibility of guessing on the first attempt is 1 in 2^256.

[Max_Rose]

1. Bitcoins Algorithm is known as SHA-256

2. It is extremely difficult to brute force due to the fact the hash is solved in a linear and unidirectional manner so reversal of this function is impossible.

[JackRatt]

1. SHA-256

2. because the bitcoin hash is only solved linear and the hash cannot be reversed and therefore raw data cannot be obtained.