World's Best AI Learning Platform with profoundly Demanding Certification Programs
Designed by IITians, only for AI Learners.
Download our e-book of Introduction To Python
Related Blog
Top Discussion
Exception Type: JSONDecodeError at /update/ Exception Value: Expecting value: line 1 column 1 (char 0) How can I write Python code to change a date string from "mm/dd/yy hh: mm" format to "YYYY-MM-DD HH: mm" format? How to leave/exit/deactivate a Python virtualenvironment Change the hyperparameter means ? Why is my f1_scores different when i calculate them manually vs output by sklearn.metrics What is the method for assigning a non-scalar value to a PyTorch tensor? Find the Largest and smallest items in a collection. How Python interpreter Works? Join Discussion
Top Courses
Master's In Artificial Intelligence Job Guarantee Program
4.5 (1,292 Ratings)
559 Learners
Webinars
Hash Functions in Python
Shashank Shanu
a year ago
Table of Contents
- Introduction
- Hash Function
- Flowchart
Introduction
Python
supports a Hash function which helps to map a large amount of data to a fixed
value with a specified length. This function always ensures that an input
results in the same output, which is known as a Hash sum. Hash sum helps to
hold a characteristic with specific information.
It is
impossible to revert this hash function, so we will almost never find a
third-party attack like brute force. This kind of algorithm is also known as a one-way
cryptographic algorithm.
Some of the main
properties of an ideal cryptographic hash function are as follows –
- It is almost easy to compute the hash value for any given input.
- It is not feasible to generate the original input from a given hash value.
- It is not feasible to modify the input without changing the hash value.
- It is not feasible to find two different inputs with the same hash value.
Let’s
take an example to get a better understanding
Example
In this example we will how it helps
in matching passwords using characters in hexadecimal format.
import uuid
import hashlib
def hash_password(password):
# userid is used to generate a random number
salt = uuid.uuid4().hex #salt is stored in hexadecimal value
return hashlib.sha256(salt.encode() + password.encode()).hexdigest() + ':' + salt
def check_password(hashed_password, user_password):
# for storing passwords hexdigest is used as an algorithm
password, salt = hashed_password.split(':')
return password == hashlib.sha256(salt.encode()
+ user_password.encode()).hexdigest()
new_pass = input('Hello User, Please enter required password ')
hashed_password = hash_password(new_pass)
print('String to store in the db is: ' + hashed_password)
old_pass = input('Please, Re-enter new password ')
if check_password(hashed_password, old_pass):
print('You entered the right password')
else:
print('Sorry but the password does not match')
Output:
Hello User, Please enter required password 123
String to store in the db is: 24391247aaaaa26070f9b5f1f06c4526f9819ad511d2356ebb75ad9037b5baa8:e88744d2fda34e3b9b0d76c35bf049b1
Please, Re-enter new password 234
Sorry but the password does not match
Hello User, Please enter required password 123
String to store in the db is: a53693b8e064159fc8ad2926405fa7ac878890072c75d6415b5c1eae772a3198:46c3623f467b42f69fb19e668f491214
Please, Re-enter new password 123
You entered the right password
Now let’s try to understand with
the help of a flowchart
Flowchart
The logic of this program is explained with the help of the following flowchart −
Here the password entered twice matches with the
hash function. It ensures that the password entered twice is accurate, which
helps in gathering useful data and save them in an encrypted format.
I hope you enjoyed reading this article and finally, you came
to know about Hash Functions In Python.
For more such blogs/courses on data science, machine
learning, artificial intelligence and emerging new technologies do visit us at InsideAIML.
Thanks for reading…
Happy Learning…