Secure Source of Randomness

python3/09_Iterators_generators_coroutines/03_generators/generators.py

@@ -1,5 +1,5 @@
 import itertools as it
-import random
+import secrets
 
 
 def squares(start, end):
@@ -221,7 +221,7 @@ def tabu_generator(n, len_, recent=None):
         recent = n // 2
     tabu = []
     while len_ > 0:
-        v = random.randint(0, n - 1)
+        v = secrets.SystemRandom().randint(0, n - 1)
         if v not in tabu:
             yield v
             tabu.append(v)
@@ -233,7 +233,7 @@ def tabu_generator(n, len_, recent=None):
 # Count how many permutations occur for different values of recent.
 
 for recent in range(0, 6):
-    itemgen = (random.randint(0, 7) for i in tabu_generator(8, 10**5, recent))
+    itemgen = (secrets.SystemRandom().randint(0, 7) for i in tabu_generator(8, 10**5, recent))
     total = 0
     for _ in unique_permutations(itemgen, 8):
         total += 1

python3/10_Modules/09_random/01_random_numbers.py

@@ -1,7 +1,7 @@
 #!/usr/bin/python
 # -*- coding: utf-8 -*-
 import os
-import random
+import secrets
 
 """
 Purpose: Demonstration of random module
@@ -15,28 +15,28 @@
 In Python3, 'secret' module is used for cryptographic purpose.
 """
 # Generate a pseudo-random number between 0 and 1.
-print("random.random()      :", random.random())
+print("random.random()      :", secrets.SystemRandom().random())
 
 # Generate a large pseudo-random number
-print("random.random() * 100:", random.random() * 100)
-print("random.random() * 100:", random.random() * 100)
+print("random.random() * 100:", secrets.SystemRandom().random() * 100)
+print("random.random() * 100:", secrets.SystemRandom().random() * 100)
 
 # if we set the seed, we guarantee that we will get the same answer
-random.seed(18485)
+secrets.SystemRandom().seed(18485)
 # NOTE: only supported seed types are: None,int, float, str, bytes, and bytearray.
 
-print(random.random())  # should give 0.6797936184081204
-print(random.random())  # should give 0.9122712611873796
-print(random.random())  # should give 0.12926723301605425
+print(secrets.SystemRandom().random())  # should give 0.6797936184081204
+print(secrets.SystemRandom().random())  # should give 0.9122712611873796
+print(secrets.SystemRandom().random())  # should give 0.12926723301605425
 
-random.seed("slartibartfast")
-s = [random.random() for i in range(3)]
+secrets.SystemRandom().seed("slartibartfast")
+s = [secrets.SystemRandom().random() for i in range(3)]
 print(s)  # should give [0.7725766895236029, 0.850635131875668, 0.11481894112205038]
 print()
 
 print("os.urandom(1024)", os.urandom(1024))
-random.seed(os.urandom(1024))
+secrets.SystemRandom().seed(os.urandom(1024))
 
-print(random.random())  # should give 0.7819713562511514
-print(random.random())  # should give 0.4669615948613485
-print(random.random())  # should give 0.6987920562874854
+print(secrets.SystemRandom().random())  # should give 0.7819713562511514
+print(secrets.SystemRandom().random())  # should give 0.4669615948613485
+print(secrets.SystemRandom().random())  # should give 0.6987920562874854

python3/10_Modules/09_random/02_random_numbers.py

@@ -1,4 +1,4 @@
-import random
+import secrets
 
 """
 Purpose: demonstration of random module
@@ -7,40 +7,40 @@
     called the Mersenne Twister.
 """
 # Pick a random number between 1 and 100.
-print(random.randint(1, 100))  # 75
+print(secrets.SystemRandom().randint(1, 100))  # 75
 # randint also includes the upper bound value
 
 # Pick a random floating point number between 1 and 10
 # random.uniform(a,b) => a <= N <= b
-print(random.uniform(1, 10))
+print(secrets.SystemRandom().uniform(1, 10))
 
 # Generate a randomly selected element from range(start, stop, step)
 # random.randrange(start, stop[, step])
 for i in range(3):
-    print(random.randrange(0, 101, 5))
+    print(secrets.SystemRandom().randrange(0, 101, 5))
 
 
 items = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
 
 # Pick a random item from the list
-x = random.sample(items, 1)
+x = secrets.SystemRandom().sample(items, 1)
 print(x)
 # Pick 4 random items from the list
-y = random.sample(items, 4)
+y = secrets.SystemRandom().sample(items, 4)
 print(y)
 
 mountains = ["Andes", "Himalayas", "Alphes", "Aplachein", "Ural", "Vindhya"]
 
 # Pick a random item from the list
-x = random.sample(mountains, 1)
+x = secrets.SystemRandom().sample(mountains, 1)
 print(x[0])
 
 # Pick 3 random items from the list
-y = random.sample(mountains, 3)
+y = secrets.SystemRandom().sample(mountains, 3)
 print(y)
 
 # Pick a random item from the list
-x = random.choice(mountains)
+x = secrets.choice(mountains)
 print(x)
 print()
 
@@ -49,7 +49,7 @@
 def shuffler(mylist):
     new_list = []
     while len(mylist):
-        rand_pos = random.randint(0, len(mylist))
+        rand_pos = secrets.SystemRandom().randint(0, len(mylist))
         new_list.append(mylist[rand_pos])
         del mylist[rand_pos]
     return new_list
@@ -58,5 +58,5 @@ def shuffler(mylist):
 print(shuffler(["a", "b", "c", "d", "e"]))
 
 numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
-random.shuffle(numbers)
+secrets.SystemRandom().shuffle(numbers)
 print("after shuffle", numbers)

python3/10_Modules/09_random/03_tossing_coin.py

@@ -1,5 +1,5 @@
 # coin -- head/tail
-import random
+import secrets
 
 outcomes = {
     "heads": 0,
@@ -9,7 +9,7 @@
 
 
 for i in range(10000):
-    outcome = random.choice(sides)
+    outcome = secrets.choice(sides)
     outcomes[outcome] += 1
 
 print("In 10000 tosses,")

python3/10_Modules/09_random/04_random_name_generator.py

@@ -1,11 +1,11 @@
-import random
+import secrets
 
 
 def random_name_generator(first, second, count):
     _names = []
     for _ in range(count):
-        fst_name = random.choice(first)
-        lst_name = random.choice(second)
+        fst_name = secrets.choice(first)
+        lst_name = secrets.choice(second)
         name = f"{fst_name} {lst_name}"
         _names.append(name)
     return _names
@@ -14,8 +14,8 @@ def random_name_generator(first, second, count):
 def random_name_generator(first, second, count):
     _names = set()
     while len(_names) < count:
-        fst_name = random.choice(first)
-        lst_name = random.choice(second)
+        fst_name = secrets.choice(first)
+        lst_name = secrets.choice(second)
         name = f"{fst_name} {lst_name}"
         _names.add(name)
     return _names

python3/10_Modules/09_random/05_cards_game.py

@@ -2,7 +2,7 @@
 ## A deck of cards has 13 cards each of 4 suits: heart(♥), spade(♠), diamond(♦), club(♣).
 ## THOUGHT PROCESS: Construct an unshuffled deck by using two lists, one for suits, another for cardValues -> Shuffle the deck by iterating over all cards one by one using their indexes, and swapping the index with any random index.
 
-import random
+import secrets
 
 suits = ["♠", "♥", "♦", "♣"]
 cardValues = ["2", "3", "4", "5", "6", "7", "8", "9", "10", "J", "Q", "K", "A"]
@@ -21,7 +21,7 @@
 # SHUFFLING CARDS: iterating over all cards one by one using their indexes, swapping the index with any random index
 # Iterate over all cards one by one using their indexes
 for index in range(0, len(deck)):
-    randomCardForSwitching = random.randrange(len(deck))
+    randomCardForSwitching = secrets.SystemRandom().randrange(len(deck))
     # Swapping indexes
     temporaryIndex = deck[index]
     deck[index] = deck[randomCardForSwitching]

python3/10_Modules/09_random/06_password_generator.py

@@ -1,29 +1,29 @@
-import random
+import secrets
 
 alphabet = "abcdefghijklmnopqrstuvwxyz .,!@_-(*)-+/|$%&=?^"
 pw_length = 34  # can change the length of your password by changing this number
 
 
-mypw = "".join(random.sample(alphabet, pw_length))
+mypw = "".join(secrets.SystemRandom().sample(alphabet, pw_length))
 print(mypw)
 print()
 
 mypw = ""
 for i in range(pw_length):
-    next_index = random.randrange(len(alphabet))
+    next_index = secrets.SystemRandom().randrange(len(alphabet))
     mypw += alphabet[next_index]
 print(mypw)
 print()
 
 
 # replace 1 or 2 characters with a number
-for i in range(random.randrange(1, 3)):
-    replace_index = random.randrange(len(mypw) // 2)
-    mypw = mypw[0:replace_index] + str(random.randrange(10)) + mypw[replace_index + 1 :]
+for i in range(secrets.SystemRandom().randrange(1, 3)):
+    replace_index = secrets.SystemRandom().randrange(len(mypw) // 2)
+    mypw = mypw[0:replace_index] + str(secrets.SystemRandom().randrange(10)) + mypw[replace_index + 1 :]
 
 # replace 1 or 2 letters with an uppercase letter
-for i in range(random.randrange(1, 3)):
-    replace_index = random.randrange(len(mypw) // 2, len(mypw))
+for i in range(secrets.SystemRandom().randrange(1, 3)):
+    replace_index = secrets.SystemRandom().randrange(len(mypw) // 2, len(mypw))
     mypw = (
         mypw[0:replace_index] + mypw[replace_index].upper() + mypw[replace_index + 1 :]
     )

python3/10_Modules/09_random/07_password_generator.py

@@ -1,20 +1,20 @@
 import string
-from random import choice, randint, randrange, sample
+import secrets
 
 print("string.ascii_letters :", string.ascii_letters)
 print("string.digits        :", string.digits)
 print("string.punctuation   :", string.punctuation)
 
 characters = string.ascii_letters + string.punctuation + string.digits
-password1 = "".join(choice(characters) for x in range(randint(8, 16)))
+password1 = "".join(secrets.choice(characters) for x in range(secrets.SystemRandom().randint(8, 16)))
 print("password1             :", password1)
 
-password2 = "".join(choice(characters) for x in range(randrange(8, 16)))
+password2 = "".join(secrets.choice(characters) for x in range(secrets.SystemRandom().randrange(8, 16)))
 print("password2             :", password2)
 
 
 print(
-    "".join(sample(string.ascii_letters, 4))
-    + "".join(sample(string.digits, 4))
-    + "".join(sample(string.punctuation, 4))
+    "".join(secrets.SystemRandom().sample(string.ascii_letters, 4))
+    + "".join(secrets.SystemRandom().sample(string.digits, 4))
+    + "".join(secrets.SystemRandom().sample(string.punctuation, 4))
 )

python3/10_Modules/09_random/08_random_gaussion_numbers.py

@@ -1,11 +1,11 @@
-import random
+import secrets
 
 histogram = [0] * 20
 
 # calculate histogram for gaussian
 # noise, using average=5, stddev=1
 for i in range(1000):
-    i = int(random.gauss(5, 1) * 2)
+    i = int(secrets.SystemRandom().gauss(5, 1) * 2)
     histogram[i] = histogram[i] + 1
 
 # print the histogram

python3/10_Modules/09_random/cipherwheel.py

@@ -1,6 +1,6 @@
 # cipherwheel.py
 import string
-from random import randrange
+import secrets
 
 # functions for encryption and decryption
 
@@ -11,7 +11,7 @@ def encrypt(m):
     outer_wheel = inner_wheel
     # calculate random secret key
     while True:
-        key = randrange(26)
+        key = secrets.SystemRandom().randrange(26)
         if key != 0:
             break
     cipher_dict = {}

python3/10_Modules/13_console_coloring/coloroma_ex3.py

@@ -1,11 +1,11 @@
 #!/usr/bin/env python
 
 import os
-import random
 import sys
 import time
 
 from colorama import *
+import secrets
 
 width, height = 80, 24
 colors = [
@@ -33,7 +33,7 @@ def main():
     position = middle_x - string_center
 
     while True:
-        color_seed = random.randint(0, len(colors))
+        color_seed = secrets.SystemRandom().randint(0, len(colors))
         color = colors[color_seed]
         print((pos(position, middle_y) + color + string))
         time.sleep(1000)

python3/10_Modules/15_turtle_module/08_spirals.py

@@ -1,16 +1,16 @@
 #!/usr/bin/python
 
-from random import randint
 from turtle import bgcolor, colormode, exitonclick, fd, pencolor, rt, speed
+import secrets
 
 bgcolor("black")
 x = 1
 speed(0)
 
 while x < 400:
-    r = randint(0, 255)
-    g = randint(0, 255)
-    b = randint(0, 255)
+    r = secrets.SystemRandom().randint(0, 255)
+    g = secrets.SystemRandom().randint(0, 255)
+    b = secrets.SystemRandom().randint(0, 255)
 
     colormode(255)
     pencolor(r, g, b)

python3/10_Modules/15_turtle_module/12_christmas_tree.py

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
-from random import randint
 from turtle import *
+import secrets
 
 
 def create_rectangle(turtle, color, x, y, width, height):
@@ -88,12 +88,12 @@ def create_circle(turtle, x, y, radius, color):
 
 # now add few stars in sky
 oogway.speed(10)
-number_of_stars = randint(20, 30)
+number_of_stars = secrets.SystemRandom().randint(20, 30)
 # print(number_of_stars)
 for _ in range(0, number_of_stars):
-    x_star = randint(-(screen.window_width() // 2), screen.window_width() // 2)
-    y_star = randint(tree_height, screen.window_height() // 2)
-    size = randint(5, 20)
+    x_star = secrets.SystemRandom().randint(-(screen.window_width() // 2), screen.window_width() // 2)
+    y_star = secrets.SystemRandom().randint(tree_height, screen.window_height() // 2)
+    size = secrets.SystemRandom().randint(5, 20)
     oogway.penup()
     oogway.color("white")
     oogway.goto(x_star, y_star)

python3/10_Modules/15_turtle_module/13_user_input_pattern.py

@@ -2,9 +2,9 @@
 """
 Purpose: User Input Pattern - Outside_In
 """
-import random
 import time
 import turtle
+import secrets
 
 print("This program draws shapes based on the number you enter in a uniform pattern.")
 num_str = input("Enter the side number of the shape you want to draw: ")
@@ -21,7 +21,7 @@
 
 numshapes = 8
 for x in range(numshapes):
-    turtle.color(random.random(), random.random(), random.random())
+    turtle.color(secrets.SystemRandom().random(), secrets.SystemRandom().random(), secrets.SystemRandom().random())
     x += 5
     y += 5
     turtle.forward(x)