Python Tutorial: Password Hashing 🔑

Welcome to our comprehensive guide on Password Hashing in Python! This lesson is designed for both beginners and intermediates, so let's dive in! 🌊

What is Password Hashing? 💡

Password Hashing is a process of converting plain text passwords into a form that can be securely stored in a database. The hashed password cannot be reversed to the original password, but if a user enters the correct password, we can check if its hash matches the stored hash.

Why Password Hashing? 🤔

Hashing passwords is crucial for security because it:

Protects passwords from being exposed in plain text.
Makes it difficult for hackers to crack passwords.
Allows secure password storage and transmission.

Python Libraries for Password Hashing 📝

Python offers several libraries for password hashing, but for this lesson, we'll focus on hashlib. It's built-in, cross-platform, and secure.

Hashing a Password 🎯

Let's hash a password using hashlib.

python

import hashlib
password = "mysecretpassword"
hashed_password = hashlib.sha256(password.encode()).hexdigest()
print("Hashed Password:", hashed_password)

Pro Tip: Always encode the password before hashing to ensure it's bytes, not a string.

Checking a Password ✅

To check a password, we hash the entered password and compare it with the stored hash.

python

entered_password = "mysecretpassword"
stored_password = "4c6dc78454e10ededaa3754cb0350c0d45d8d93e80f6649bf86fba858bb0fb9e"

if entered_password == stored_password:
    print("Password is correct.")
else:
    print("Incorrect password.")

Quiz: Why do we need to encode a password before hashing in Python?

To make it a bytes object
To convert it to a string
To encrypt it
To decode it

Salted Hashing 📝

Salted hashing adds a random string (salt) to the password before hashing, making it more secure. Here's an example:

python

import os
import hashlib
salt = os.urandom(16)
password = "mysecretpassword"
hashed_password = hashlib.sha256(salt + password.encode()).hexdigest() + salt.hexdigest()
print("Hashed Password:", hashed_password)

Salted hashing makes it harder for attackers to find the same hash even if they have the same password.

That's all for our Password Hashing tutorial! Practice these concepts to strengthen your Python skills. Happy coding! 🦘🚀

Note: Always store salted hashes securely and never store plain text passwords.

Quiz: Why do we use salted hashing?

To make it easier to crack passwords
To make it harder to crack passwords
To make hashing faster
To make hashing slower