Reading assignment: Hashing

[Mick]

Hashing
1.What is the hashing algorithm called in Bitcoin?
The hashing algorithm used in Bitcoin is called SHA-256

2.Why is this hashing algorithm really hard (almost impossible to brute- force?
The hashing algorithm SHA-256 is the algorithm used a Bitcoin. Brute forcing this algorithm is very time consuming. Brute forcing would require one to compare two hashes that match together. In SHA-256, the time to uncover the correct hash would be 2^256, which would be realistically, out of a person’s reach in their lifetime. This algorithm is very secure and would be costly to attack continuously.

[Damon]

1. What is the hashing algorithm called used in Bitcoin?
   Ans: SHA 256 is the Cryptographic Algorithm used by Bitcoin

2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
   The time needed to have a successful Brute-Force attack would take many years to achieve. Something like 2^38, the 38 represents the 0’s behind the number 2.

[Naz]

1. Bitcoin uses SHA-256 (Secure Hashing Algorithm 256).

2. Because it takes an exhaustive search to guess the input data (no matter how big or small the input is) from the hash value/output (256-bits long) computed by the hashing algorithm SHA-256. A massive amount of time and energy are required to solve the problem of finding the input data. Today, to brute-force SHA-256 is perceived to be too expensive to be profitable. Thus, giving SHA-256 the label of ‘secure’. For this reason, finding the input data is infeasible, not impossible. Luck is also in the search/guessing mix!

[Lukasz]

• What is the hashing algorithm called used in Bitcoin?

Bitcoin uses SHA-256 encryption.

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

Using SHA-256 for example, encryption is strong enough to make brute-force highly time consuming and almost impossible to find a collision.

[patryan]

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 it has the following properties: preimage resistant which means it is infeasable to compute the input data based on the output hash and when data sets are really large this becomes astronomical.

[Andre_K]

1. SHA-256

SHA-256 is hard to brute force because it would take up to 2^128 – 1 times to find the correct input.

[itsellageee]

1. Secure Hashing Algorithm 265 (SHA-265)

2. Use of deterministic properties, quick computation, collision and pre-image resistance means the odds of achieving a match to the target input is astronomical and would take so long to attempt it’s not worth the time/energy to do so.

[Amjak]

1. SHA 256
2. The SHA 256 hashing algorithm is extremely difficult to brute-force because it takes an average of 2^128 runs to break the pre-image resistance and that takes an infeasible amount of time to achieve.

[Remy]

1. SHA 256

2. Its hard to reverse the output of the function to get back the input.

[dividale]

1. sha256
2. The likelihood of hashing the algorithm by brute-force is possible although extremely unlikely due to the number of computations and time factors.

[fredbob47]

1. Bitcoin uses the Secure Hashing Algorithm SHA256
2. Because mathematically the are 2^256 different possibilities and it is infeasible that the exact output would be easily found

[Mcilvery]

1. The hashing algorithm used in Bitcoin is SHA-256.
2. The min-entropy distribution is so high that it would take too long to brute-force a hash using the SHA-256 algorithm.

[STrismosin]

1. Secure Hashing Algorithm 256 (SHA256)

2. To input random values in an attempt to duplicate a specific hash output would take an incredible amount of time. Very small changes to the input create significant changes in the output.

[MEC]

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 number of times it would take to guess the correct number is more times than its worth.

[Petr_Hajdusek]

1. What is the hashing algorithm called used in Bitcoin?
   Hashing is generating a value or values from a string of text using a mathematical function.

2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
   Because you need to generate hash 2^128 – 1 times in worst scenerio and compare with hash you want to break to achieve a “hash break” or brute decoding the original value.

[Vlad.G]

1. SHA256
2. It’s hard becouse of the mathematical design.

[Dallas]

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

Secure Hashing Algorithm 256 or SHA-256

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

Due to the cryptographic nature of the Bitcoin SHA-256 hash. The only method available to you to find the pre-hash input, is by using the “brute force method”. This method means that you have to input a random variable, hash it and then compare the output with the target hash and repeat until you are successful. As the number of input variables are so vast in SHA-265 even with collision resistance factored in, this “brute force” input method is random, the probability of success is very small over a short time period.

[BISKITBLOKCHOP]

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?
   Statistically speaking, the amount of variables are so huge { 1 in 2^127 = 1.7 X 10^38 } for you to be right, that it doesnt matter.

[ashishc]

1. What is the hashing algorithm called used in Bitcoin?
   SHA256
2. Why is this hashing algorithm really hard (almost impossible) to brute-force?
   It is almost impossible to brute force because minor change in the input can change the output data.

[xiaomae]

1. The hashing algorithm used in Bitcoin is SHA-256.
2. SHA-256 is almost impossible to brute-force because there are 2^256 - 1 possible hash outputs that would have to be compared to a target hash to find a match, which would take too long.