Reading assignment: Hashing

Blockchain and Bitcoin 101
#4559

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

  2. the hashing algorithm is hard because it requires a significant amount of computer power to determine a specific function within a set time interval.

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#4560

I cannot reach the website article - ???

#4561
  1. Secure Hashing Algorithm
  2. The process of guessing a value equal or below the target hash value is both highly computationally demanding, and least probable with the value having 256 digits.
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#4562
  1. What is the hashing algorithm called used in Bitcoin?
    A: SHA-256
  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    A: In order to validate the hash (SHA-256) - the Bitcoin network presents a challenge (nonce) of 32 bits. This challenge must met with a response of a 32 bit number that when the nounce and the responce is hashed using SHA-256 the results will be a long fixed length number of bits for which the leading 40 bits are “0s” . It is estimated that just 9 leading 0s would take nearly 70 billion attempts or a little over a week using a computer with the algorithm to generate the tries. To guess at reponces to get 40 leading 0s are magnitudes higher. That is why it is near impossible to brute force a proper response.
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#4563
  1. SHA-256
  2. Because currently there is not enough computational power to decrypt the output of SHA-256. Some say that once the quantum computers are here, they will be able to decrypt current hashing algorithms within seconds. But we’re not quite there yet XD
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#4564

  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?
    A brute-force search has a 1/(2^256) chance of finding a specific hash result per try. With a hashrate of 14TH/s it would take ~810^63 seconds (~2.610^56 years) to go through the whole space and even a small fraction of that would still be prohibitive unless some weakness were exploited.

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#4565

1 SHA 256 Secure Hashing Algorithim
2. It is impossible to guess the calculation due to the endless possibilities of what the input was. Further, it would affect the other blocks if there was a change on the block as they are all interlinked.

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#4566

[quote=“ivan, post:1, topic:8422, full:true”]
Answer the questions below.

  1. What is the hashing algorithm called used in Bitcoin?
    SHA256 is a hashing algorithm used to secure the transactions in bitcoin blockchain

  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
    Because of its main feature which is the “one way” ticket (Complex math functions/theories). Once the transaction is done it is technically impossible to get it in the “raw material” back.

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#4567
  1. sha 256
  2. You can’t calculate input with the output data because the number of combinations are so many, that it would take too many years to solve.
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#4568

  1. SHA256 is the hashing algorithm used to secure the transactions

  2. Once it went through the machine it is impossible to rewind the process

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#4569
  1. SHA-256
  2. The high number of possible, practically random, outputs makes brute-forcing unfeasible. Furthermore, a small change in the input generates a completely different, seemingly random output, making it unpredictable and unfeasible to optimize brute-forcing.
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#4570
  1. SHA256
  2. The hashtag algorithm is so hard to brute force because there are so many miners with high powered rigs mining transactions successfully that getting rewarded for the right hash algorithm is equivalent to winning the lottery. Need the right tech to compute so many variables quickly and accurately.
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#4571

Bitcoin hashing algorithm is called SHA-256.

Proof-of-Work means that it requires certain amount of work to be done before new blocks get added on the blockchain.

It takes approximately 10 minutes to mine a block on Bitcoin blockchain. As the amount of miners grow the work becomes harder, making the network more secure and controlling the block rate.

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#4572

1- The Bitcoin hashing algorithm is called SHA 256.

2- It is hard because it is life time consuming effort due to the need to endless possibilities.

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#4573
  1. SHA-256.
  2. It would take too much time to brute force it. 2^256
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#4574
  1. Sha 256
  2. The brute force of a 256 hash is almost impossible, however super computers may pose a threat to that in the near future but still would probably not be worth it
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#4575

  1. The hashing algorithm used in Bitcoin is called SHA -256.

  2. A brute force attack is a hacking method that uses trial and error to crack passwords, login credentials, and encryption keys (google). Every output (hash) is unique. Hash algorithms are produced in a linear manner and can not be reconstructed to find its original data. This makes it almost impossible to brute-force.

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#4576
  1. SHA-256
  2. A brute force attack is difficult because you cannot reverse an output to derive its original input(s).
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#4577
  1. sha 256
  2. the number of outcomes is too large to be able to guess it
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#4578

What is the hashing algorithm called used in Bitcoin?

a Secure Hash Algorithm (SHA) named SHA-256

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

The total number of possibilities is so large that it is unlikely two people get the same result in their lifetime

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