Reading assignment: Hashing

Blockchain and Bitcoin 101
#2953
  1. SHA-256, Secure Hash Algorithm
  2. It has a different 256-digit alphanumeric code with each addition to a blockchain that only works linearly, making it impossible to duplicate on the fact that the address of it would be unaccounted for.
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#2954

  1. What is the hashing algorithm called used in Bitcoin?
    The bitcoin algo is called - Secure Hash Algorithm (SHA) named SHA-256.

  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    So much energy and computational power are required to find the outcome whereby 2 inputs produce the same output in a hash function, occurs.

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#2955
  1. SHA-256
  2. It requires guessing the nonce value until the block header address has a proper address. There is a very large range of numbers for the nonce.
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#2956

Mining is not exactly the same as brute force. When brute forcing one is trying to find the exact same hash output, while miners are trying to find a new hash that is below a certain target. :slight_smile:

2 Likes
#2957

Homework Hashing 1/15/21

  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 the NSA invented it. I’m sure their data scientists more or less knew what they were doing to secure their algorithm. Ya, that’s a weak answer…

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#2958

  1. SHA-256

  2. The hashing algorithm is really hard to brute force as the hashing is one directional and to ‘guess’ successfully more than once is near impossible. Hashing algorithms cant be reversed to reveal the initial input.

1 Like
#2959
  1. What is the hashing algorithm called used in Bitcoin?

SHA-256

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

Because output is created by SHA-256 algorithm and solving that output is really hard because there is too many possibilities.

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#2960
  1. SHA256
  2. It’s impossible to find input based on output.
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#2961

  1. I just thought of somethung. How did satishi get involved with a cpu security program for the nsa? It couldnt be just some kid cus thats high level stuff. Sha 256

  2. The sha 256 algorithm is 1 directional

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#2962

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

#2963

SHA256 is a well used algorithm in computer science. It has many implementations in different languages by different people. It was merely developed by NSA but anyone can use it in any way they want. :slight_smile:

#2964

What happened to the second part of the homework? :wink:

#2965

1: its SHA 256
2: its linear oneway algorith. output can not be reversed back to input value.

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#2966
  1. What is the hashing algorithm called used in Bitcoin?

SHA-256 Algorithm

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

Because it is a 256-bit alphanumeric code which is a highly difficult mathematical equation that demands dedicated hardware and software requiring high amounts of computational capacity. Also, these algorithms can only produce a hash output, they can’t be reversed in order to find the original input data.

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#2967
  1. What is the hashing algorithm called used in Bitcoin?
  • The hash algorithm called in Bitcoin is SHA-256 which is a universal translator for computers.
  1. Why is this hashing algorithm really hard (almost impossible) to brute-force?
  • Because the hash algorithm has so many and different possibilities which make the brute forcing impracticable.
2 Likes
#2968

  1. Secure Hash Algorithm named SHA-256 invented by NSA. It is able to receive any form and size of data and transform that in an 256-bit alphanumeric string.

  2. Bitcoin hash is only calculated in a unidirectional manner. Because SHA-256 can only find the hash output, they can not be reversed, this can be guaranteed through intricate mathematical equations. Any attempt to find an original data, is like after cooking a soup, try to recognize all ingredients and return that to exactly original form before they being cooked.

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#2969
  1. Bitcoin uses SHA-256 hashing algorithm.
  2. Each output/hash is unique, can’t be reversed and has to be verified by multiple miners.
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#2970

Hash functions in itself have nothing to do with mining. Mining utilizes hash functions in the PoW process. The reason why hashing algorithm is hard to brute force is mostly because of the sheer number of possible outputs. :slight_smile:

2 Likes
#2971

1.Bitcoin uses the SHA-256 Hashing Algorithm.

  1. Bitcoin is impossible to brute force because of the large number of outcomes that can be produced using the SHA-256 Algorithm. Each hash a miner produces is a guess. If the hash does not fall below the target value (set by the mining difficulty) the block header is changed and a new hash is produced and compared to the target value once again. Also, since the SHA-256 Algorithm is non-reversible, you cannot take the output and reverse the transaction to arrive at the input further complicating the possibility of a successful brute force attack.
1 Like
#2972

  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 256 bit encryption, generating a random number that is close enough to matching the block in the time needed to make a difference is astronomical.

1 Like