Answers
Hash functions are computing models. Basically, when you give it an input, it transforms it into an output. The same input always gives the same output, but you can never get your input with your output. That’s the key.
In the BTC blockchain miners try to solve a block by putting their inputs to get a certain type of output. When they are successful, they’ll be rewarded with bitcoin.
It means that it’s hard to find the same output with different outputs.
1.) Hash functions are functions that can be given an input and will output a series of symbols that is a hash. These hash outputs cannot be used to find it’s input. If even one letter/symbol is changed in the input then the output will be completely different.
2.) Bitcoin uses hashes functions to write new transactions into the blockchain. When a transaction is written into the bitcoin the hash is public but no one can find the input with the hash, which is the beauty of blockchain in bitcoin.
3.) Collision resistance is when there is a very low chance of two different inputs hashing the same output.
Functions that produce a unique output for every unique input. The produced output cannot be traced back to the input.
It is used by miners to create a hash for every Bitcoin block’s header (to identify that block) that’s added to the Bitcoin blockchain. The smaller the hash needs to be, the more challenging (and computationally intensive) it is to create it.
It means that it is very difficult to find 2 different inputs that will produce the same hash output.
it is a mathematical only One Way function that an unique imput, gives a fingertip output ( unique output).
Hash functions are an essential part of, not only of the bitcoin protocol, but of information security as a whole. In the bitcoin protocol, hash functions are part of the block hashing algorithm which is used to write new transactions into the blockchain through the mining process.
*Collision resistance - it should be hard to find to distinct inputs that would result in the same hash after the application of the hash function.
Hashing functions are a computation process that produces a one way unique output given a specific input.
Hashing functions are used in cryptocurrencies to secure the data and communication on the blockchain. Because hashing functions are used, transaction history can be verified and compared to ensure it has not been falsified.
Hashing functions need to be collision resistant because if the output of a function can be easily reproduced then the reproduction mechanism can be used to compromise the blockchain or falsify transaction history.
Homework on Hash Functions - Questions
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1.hash function are functions where input creates an output. 2. To encrypt the transaction data so its secure. 3. its almost impossible to generate the same hash for a different output.
Taking a string of data and generating an unique output, digital fingerprint of that specific data. The output will be an unique string of random digits/letters.
Miners are struggling to mine a block and get the reward by randomly combining their own arbitrary piece of input data with all the inputs available to generate a hash that starts with 0’s. The first miner that solves the puzzle and has a hash that starts with 18 0’s (as of now), mines the block and gets the reward.
Means that every hash should be unique. A (D) will not be the same with a (B).
Hash functions are functions that are capable of accepting inputs and returning a unique output for each unique input.
It is used to pass transaction information anonymously which helps to achieve the consensus mechanism of Bitcoin.
This means that Hash functions should always produce a unique output for every unique input.
Hash functions are functions that take in an input and produce an output, but has no reciprocal function. That is, given an output to a hash function, there is no function that can take you back to the original input value.
All transaction information (as well as the hash for the previous block) for a particular time period is hashed. This hash becomes the new block on the blockchain.
Collision resistant is the measure of how likely two or more hash inputs will generate the same hash output.
1.Hash functions are one way functions where each unique input produces a unique out put
2. Hash functions encript the data so its secure for transactions to be made
3.It is very dificult to find tow inputs that produce the same output in a hash function
Hash function is software algorithm that produce a unique digital fingerprint, a sort of computational digital signature. It’s the result of any given data inputted. Any altercation to the original data will give a different hash output. Each input data will result in a distinct hash signature. Hash functions is one way mechanism. Any output data cannot be used to reverse and recalculate the back to the original raw data. Only input data can generate the output hash.
The 64 bit string of numbers and letters is a cryptographic result of SHA 256 is called the hash. A hash function is a type algorithm used in bitcoin called SHA 256, created by NSA, it’s function is sort of a universal translator, in which any data of any size can be input and translate them into 64 alpha numeric strings (can be 128 bit or 256 bits as well).
It’s imperative that the bitcoin blockchain is safe and secure. Each block on the blockchain is cryptographically linked together through the hash function, which unique and cannot be altered. If anyone attempts to alter it the current hash will change.
In order to Mine bitcoin successfully one needs to keep solving a cryptographically puzzle in while in competition with other miners for one’s block to be apprehended to the blockchain network. There are financial rewards and incentives the miners to mine.
The hash functions need to be collision resistant in order to avoid to different inputs to produce the same output.
Describe hash functions with your own words.
Each unique input gives a unique output, a fingerprint. When you change something you get a different fingerprint. You can go from input to output, but you can’t go from output to input. It’s a one way function.
How are hash functions used in cryptocurrencies like bitcoin?
They are primarily used for generating public keys and block hashing. Block hashing is a core concept of Bitcoin mining.
What does it mean when we say that hash functions need to be collision resistant?
Collision resistance is the property of a hash function that it is computationally infeasible to find two colliding inputs.
Describe hash functions with your own words
Hash functions are an input of data that will be recorded and given its own unique output. The output will have a unique # matching that particular data entry.
How are hash functions used in cryptocurrencies like bitcoin?
Hash functions are used when new wallets are generated and the private keys that go along with the ownership of the wallet. These unique sets of numbers show property or ownership of the wallet and funds.
What does it mean when we say that hash functions need to be collision resistant?
Collision resistance is computationally infeasible to find two colliding inputs. It is very hard to get the same output for two different data entries.
Mathematical equations designed to give unique irreversible outputs.
They are used to encrypt input information into blocks.
It is computationally difficult to find matching Inputs.
1). Hash functions are adding a unique set of numbers or letters that will produce a unique set of binary linear non-directional output. Input a set of numbers I will get a digital finger print of that number. The input can be any amount of numbers/ letters or different lengths, but the output will have a fixed length. The output is called the hash. Also, you can never go from output to input, hash function is a one-way function. There are many hash functions, but for bitcoin the algorithm is SHA 256. The only way to recreate the input value from a complex hash function is to brute-force search all possible inputs, but this is nearly impossible.
2). In the Bitcoin protocol, SHA 256 mining is used to solve a mathematical formula. Hash functions use data structures in computing tasks, that check the integrity of the message and to verify the information. Hash functions add security to the data/information to make more difficult to see the information being sent or received. Cryptographic hash functions provide three properties: They are collision free, can be hidden one way transaction difficult to guess input from output. Also, difficult to select an input that will provide a pre-fined output. Password verification can also be stored as a hash function, along with signature generation and verification, which means you can verify signatures to authenticate digital documents and messages. Three algorithms are used: key generation algorithm, a signing algorithm and a private key algorithm all produce a digital signature. Merkle trees is a technology used in cryptocurrencies, as kind of digital signature.
3). Collision resistant means it is very hard to find two same inputs to produce the same output.