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1.1 KiB
1.1 KiB
Semi Brute
Hash functions are used to secure information. A piece of data, for instance a password, is hashed and only its hash is stored. While there is no way to compute on the original information, one can try every possible value. This is called a brute force attack.
Proof of Work algorithms work in a similar manner. Miners hash a block and modify it continuously to obtain a certain value.
We will create an example of this with a function that finds a string which hash starts with a given value.
Instructions
Create a function semiBrute() that takes as argument a target, which is a two characters hexadecimal number, and returns a string which hash sha256 starts with the target.
Usage
solution = semiBrute('e2')
console.log(solution)
// One valid result : 'abcdefghijklmnopqrs'
// You might find other valid solutions as we only check the first two characters