You and your friend who lives far away want to fairly and randomly select which of the two of you will travel to the other’s hom
e for a visit. Your friend remembers having learned about using hashes as cryptographic commitments and proposes to use a coin toss to decide. He tells you to randomly choose ‘heads’ or ‘tails’ by throwing a coin, hash the result using sha256, and send him the hash. Once you have committed to the outcome, he’ll guess ‘heads’ or ‘tails’, you’ll reveal to him your choice and he can verify that the hash is correct. If his choice matches your coin toss, then your friend wins and you have to make the trip. What is the problem with this scheme, as described? a.there’s no way to prove that your coin toss is random
b.there’s no way to prove that sha256 is collision resistant
c.your friend can hash all possible options and discover your secret
d.unless you sign the hash message your friend can’t be sure it was you who sent it
c. your friend can hash all possible options and discover your secret.
Explanation:
SHA-256 is a set of hash functions that was designed by the NSA. SHA-2 is considered an upgrade on the set that was its predecessor, SHA-1. A hash is a mathematical function that condenses data in a process of one-way encryption. SHA-256 creates hash algoritms that are considered irreversible and unique. However, one of the properties of hashing algorithms is determinism, which means that any computer in the world would be able to compute a particular hash and get the same answer.
A router is a more complex device that usually includes the capability of hubs, bridges and switches. A hub broadcasts data to all devices on a network. This can use a lot of bandwidth as it results in unnecessary data being sent - not all computers might need to receive the data.
The truth is that you do not get to just make an account and post. He keeps it steady by having a highly trained group of people go through all the information and make sure it is correct before they let it be posted. They have not, however, changed things that were posted before those people started to work.
The ability to learn and use basic computer hardware and software understanding to solve problems and to access information is known as computer fluency. and other options are not correct, that can be defined as follows:
In option A, computer knowledge is a basic general awareness, that helps the user to use the computer more fluently, that's why it is not correct.
In option C, It is an internal feature of the computer, that helps to transfer data, that's why it is not correct.
In option D, computer information is also known as data that is stored in the computer, that's why it is not correct.
Excel Solver does not allow for the inclusion of greater than or equal to, less than or equal to or equal nomenclature as Excel will not recognize these.
