Reading assignment: Hashing

Blockchain and Bitcoin 101
#2531
  1. SHA-25
  2. Because, as it is 128 characters long, a collision is very hard to be found
1 Like
#2532

Its 256 bits long, which is 64 characters in HEX. :slight_smile:

1 Like
#2533

[quote=“ivan, post:1, topic:8422”]

  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 is like trying to reverse backwards the recipe of a pizza or an hamburger, it can take several years and alot of power to run the system.
1 Like
#2534

I had SHA3-512 in my notes, is this from the past, or is it possible in the future? I’m a little confused as to how I got this answer. The reading assignment didn’t even mention Bitcoin. Am I missing something here?

2 Likes
#2535

Yeah, we updated the reading assignment because it has some errors init, but it’s easy to find on Google.
Sha 3 is just some other hashing algorithm.

#2536

  1. SHA-256 is the hashing algorithm used in Bitcoin

  2. The total number of possibilities is so extremely large that it is unlikely that a collision would happen.

1 Like
#2537

Reading Assignment: Hashing (Answers)

  1. SHA-256
  2. Because you need to UPDATE
#2538
  1. What is the hashing algorithm called used in Bitcoin?

SHA256 (Secure Hashing Algorithm 256-bit)

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

It requires extreme commitments of time and computing power to identify the few collisions that exist (as there are so many variables). Furthermore, hashes (outputs) can also not be reverse-engineered into inputs (original content). When SHA-3 instead of MD5 is used, this becomes even less feasible.

1 Like
#2539
  1. Sha256
  2. because hash functions are not mathematically possible to reverse calculate, the only way to do it is by brute forcing it. This means that you need to keep guessing the input and check the hash if it matches. Brute forcing is like guessing a pin number by keep trying every combination until you succeed. In Sha256, the possible combination is so huge that it is just not feasible. You need to spend so much time and energy that’s it’s simple not worth it.
2 Likes
#2540

  1. SHA256

  2. SHA256 maps any input number to a random number between 1 and 2^256. It is a fast and easy calculation to go from the input number to the output number but impossible to calculate the input number from the output number.

    The only way to find the input number from the output is by guessing (brute force). The number 2^256 is so incredibly large that it is infeasible to find the input number by brute force.

1 Like
#2541

  1. SHA-256

  2. The SHA-256 algorithm produces hashes that are a lot more longer than the ones of the MD5, so it is far less likely for a brute force attack to find a collision (two different pieces of content with the same hash)

1 Like
#2542

Here you are explaining a collision, brute forcing means that you keep guessing the input, hash it and check if the hash is the same, it’s like trying out every combination of a pincode

1 Like
#2543
  1. sha 256
  2. breaking useing brute force is highly unlikely due to enormus computation matching inputs and outputs
2 Likes
#2544

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

  • Why is this hashing algorithm really hard (almost impossible) to brute-force?
    would take too long time due to too many possibilities (2^256)

2 Likes
#2545
  1. SHA-256
  2. Because it is practically impossible to find the input that gives the same output, this due to the gigantic amount of possibilities that would have to be deciphered to find it.
3 Likes
#2546

  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 function can’t be reverse calculated for the raw data

2 Likes
#2547
  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 algorithm produces unique hashes and new blocks are only added after you successfully verify the hashes in the blocks. in order to do this you have to be lucky and get a hash that is below the target value. because there is so much luck involved and so much competition it is almost impossible to brute force the algorith.
1 Like
#2548

1- SHA-256
2- since there is now way to reverse the output to calculate the raw input data, you just have to keep dedicating power and computing energy and until you get the desired out put so the sooner you start the faster ull get there, i think playing a huge role into the why btc is a high availability network

1 Like
#2549

Reading assignment: Hashing

  1. What is the hashing algorithm called used in Bitcoin?
  2. Why is this hashing algorithm really hard (almost impossible) to brute-force?

1- SHA 256 (Secure Hash Algorithm 256).

2- The number of possibilities are almost infinite with each Algorithm having distinct features and unique hashes.

1 Like
#2550
  1. SHA-256
  2. Too many possibilities, would take to long.
1 Like