Complete Git Guide: Understand and Master Git and GitHub - What is the Hash Function?

The video tutorial explains how to create and store git objects using hash functions. It introduces hash functions as one-way functions that generate a fixed-length hash from any input. The tutorial highlights the importance of hash functions in security, particularly in storing passwords as hashes in databases. It emphasizes two key characteristics: the same input always produces the same hash, and knowing the hash does not reveal the input. The video concludes with a brief overview of different hash functions.

What is the purpose of using the dash W option in the Git command?

• To merge branches

• To delete a Git object

• To write a Git object to the database

• To create a new branch

What happens when you enter the same command in Git as someone else?

• You create a new branch

• You get a different hash

• You delete the existing hash

• You get the same hash

Which of the following best describes a hash function?

• A function that duplicates data

• A function that compresses data

• A function that encrypts data

• A function that generates a fixed-length hash from variable-length input

What is a key characteristic of a one-way hash function?

• It does not allow retrieval of the original input from the hash

• It can be easily reversed

• It allows retrieval of the original input from the hash

• It generates different hashes for the same input

Why are passwords often stored as hashes in databases?

• To make passwords easily retrievable

• To allow password sharing

• To ensure passwords are not stored in plain text

• To save storage space