Reading assignment: Hashing

Blockchain and Bitcoin 101
#1167

What do you mean exactly?

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#1168

This is about brute forcing sha256 hashes. Not the blockchain network.

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#1169

You’re talking about mining. Brute forcing a hash is by keep guessing the input and hash it until you find the hash that you want to brute force. It’s very time consuming that it is not worth the time and effort.

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#1170

A Sha256 hash has 256 bits or 64 hexadecimal characters

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#1171
  1. SHA-256
  2. The probability number is astronomical.
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#1172

What is the hashing algorithm called used in Bitcoin?

The hashing algorithm used by Bitcoin is called SHA-256

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

SHA-256 is really hard (almost impossible) to crack via a brute-force method because it would take up to 2^256 – 1 attempts (worst-case scenario), which would take so much time as to make it infeasible, i.e., so long that it would not matter.

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#1173
  1. Sha-256
  2. It is hard to brute-force because It will take potentially very long time and also the probability for that is low
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#1174
  1. The Hashing algorithm is called SHA-256 (256 Bits length)
  2. The analysis of an input through a hash function will always be the same. As a result, having a different hashes every time make it impossible to keep track of the input. In fact, the quick computation make it an efficient system. It is INFEASIBLE to determine an input hash: H(A). The process of figuring out a big amount of data it is called “Brute-force”. It does consist on taking a random input, hash it and then compare the output with the largest hash. It does repeat until it finds a match. In fact, it makes it almost impossible to find, to break the pre image resistance. As a conclusion, Blockchain is IMMUTABLE!
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#1175

1.sha256
2.It has to constitute proof of work, in order to be rewarded with BTC

#1176

SHA-256

Its exceptionally difficult to brute-force the algorithm due to the computation involved. This difficulty is achieved with the use of SHA-256. This would require an average number of 2^256/2 before getting a collision, due to the high astronomical number required of tries its can be considered almost impossible.

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#1177

@Mauro thank you for the complement…just going through it in the next lessons now :wink:

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#1178

What is the hashing algorithm called used in Bitcoin?

  • SHA-256

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

  • Because using random inputs in SHA-256 increases the amount of time to brute-force that it is almost impossible.
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#1179

  1. SHA-256

  2. hashing seed is based on randomness
    output is a fixed 256 bits in length
    huge number of possible combinations

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#1180

What is the hashing algorithm called used in Bitcoin?
SHA-256

Why is this hashing algorithm really hard (almost impossible) to brute-force?
You can not find out what the input was if you only have the output unless you want to start guessing randomly but that literally takes ages and ages.

I think I got these answers right, other than that my brain is exploding from confusion haha :confused:
Guess I need a break, tomorrow a new day!

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#1181

The hashing algorithm in bitcoin is called SHA 256. This hashing algorithm is really hard to brute force because it is a string of text generated by a formula using a mathematical function, which would require a large amount of computation to produce an output. The only way to solve this puzzle is through brute-force, basically guessing. A random input is picked up, hashed and repeated until a match is found. Over time, the length of the text increases as zeros are placed at the beginning. This increases the difficulty.

#1182

Yeah you’r right! thanks for correction! I study about it today and count the length XD! 256 bits no length.

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#1183

  1. SHA-256 and RipeMD160

  2. There is no adequate computing power available at the moment to brute-force this algorithm in an acceptable amount of time

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#1184
  1. SHA-256
  2. The hash generated is so large, the algorithm to determine the hash would take to long to figure it out.
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#1185

Change my answer. Because of pre Image resistance, using brute force is nearly impossible.
So here’s the change:
This hashing algorithm is really hard to brute force because of the number of possibilities that are available to solve the puzzle.

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#1186

SHA-256
Secure hashing algorithm

Because it is almost a one way function.
It is so easy to convert data into a hash

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