diff --git a/3DES-decrypt.py b/3DES-decrypt.py
new file mode 100644
index 0000000..d790ce3
--- /dev/null
+++ b/3DES-decrypt.py
@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+from Crypto.Cipher import DES3
+from Crypto.Util.Padding import unpad
+import time
+
+# random generation of keys and iv
+key = b'TWENTYFOURBYTEKEY3DES$$$' 
+iv = b'IVIVIVIV' 
+
+size_handling = [100000, 500000, 1000000, 5000000, 10000000]
+
+for i in size_handling:
+    ciphertext = b'\x04\x88o\xcb$\xd9\xfe\xc2?\x1e\xc2\xc2\x17(\xe6{\xe6\xd3\x07}!\x0f\xef\xbe\xc4\x16\x0e\x9cC\x85\x05\x1b\xd4\xe5\x01\xf2\xaaa\\\xc3\x89BZQ[9K ' * i
+
+    t1 = time.time()
+    # create cipher object with triple DES algorithm in CBC mode
+    cipher = DES3.new(key, DES3.MODE_CBC, iv)
+
+    # decrypt the ciphertext
+    decrypted_padding = cipher.decrypt(ciphertext) # decryption
+    plaintext = unpad(decrypted_padding, DES3.block_size) #remove padding 
+
+    t2 = time.time()
+    t3 = t2 - t1 #total time to decrypt according to file size
+
+    print(f'time taken to decrypt:{t3} for size bytes:{i}')
\ No newline at end of file
diff --git a/3DES.py b/3DES.py
new file mode 100644
index 0000000..2cbaa99
--- /dev/null
+++ b/3DES.py
@@ -0,0 +1,25 @@
+#!/usr/bin/env python3
+from Crypto.Cipher import DES3
+from Crypto.Util.Padding import pad
+import os
+import time
+
+# generation of keys and iv
+key = b'TWENTYFOURBYTEKEY3DES$$$' 
+iv = b'IVIVIVIV' 
+
+# Create a 3DES cipher object with the key and IV
+cipher = DES3.new(key, DES3.MODE_CBC, iv)
+
+size_handling = [100000, 500000, 1000000, 5000000, 10000000]
+# Measure the time taken to encrypt messages of increasing size
+for i in size_handling:
+    message = b'Which witch switched the Swiss wristwatches?' * i
+
+    t1 = time.time()
+    padding = pad(message, DES3.block_size) #additional padding
+    ciphertext = cipher.encrypt(message)  # encrypts secret message
+    t2 = time.time()
+    total_time = t2 - t1  # total time taken to encrypt
+
+    print(f"time taken for secret message * {i} encryption bytes: {total_time} seconds")
diff --git a/AES-128.py b/AES-128.py
new file mode 100644
index 0000000..b6ebe92
--- /dev/null
+++ b/AES-128.py
@@ -0,0 +1,23 @@
+#!/usr/bin/env python3
+from Crypto.Cipher import AES
+import os
+import time
+
+key = os.urandom(16)
+iv = os.urandom(16)
+# Create an AES-128 cipher object with the key and IV
+cipher = AES.new(key, AES.MODE_CBC, iv)
+
+size_handling = [100000,500000,1000000,5000000,10000000]
+# Measure the time taken to encrypt messages of increasing size
+for i in size_handling:
+    message = b'Which witch switched the Swiss wristwatches?' * i
+
+    initial_time = time.time() 
+    ciphertext = cipher.encrypt(message) #encrypts secret message 
+    end_time = time.time() 
+    total_time = end_time - initial_time #total time taken to encrypt
+
+    print(f"time taken for secret message * {i} encryption bytes: {total_time} seconds")
+
+
diff --git a/aes-128-decryption.py b/aes-128-decryption.py
new file mode 100644
index 0000000..249d118
--- /dev/null
+++ b/aes-128-decryption.py
@@ -0,0 +1,23 @@
+#!/usr/bin/env python3
+from Crypto.Cipher import AES
+import os
+import time
+
+key = os.urandom(16)
+iv = os.urandom(16)
+# Create an AES-128 cipher object with the key and IV
+cipher = AES.new(key, AES.MODE_CBC, iv)
+
+size_handling = [100000,500000,1000000,5000000,10000000]
+# Measure the time taken to encrypt encrypted_messages of increasing size
+for i in size_handling:
+    encrypted_message = b'\x95lxk\xb5\xd8\xb7b9l\x153\x83}v\xceLT6U\xd6<\xf3\x92&\xb9P\x8a\x0f\xa1\xc9\x90+0\xb3zC\xbf\xa0\x89\xbf\xbb\xb5\xa8\x801c\x8d' * i
+
+    initial_time = time.time() 
+    plaintext = cipher.decrypt(encrypted_message) #decrypts message
+    end_time = time.time() 
+    total_time = end_time - initial_time #total time taken to decrypt
+
+    print(f"time taken for encrypted message to decrypt * {i} bytes: {total_time} seconds")
+
+
diff --git a/blowfish-decrypt.py b/blowfish-decrypt.py
new file mode 100644
index 0000000..418f9c6
--- /dev/null
+++ b/blowfish-decrypt.py
@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+from Crypto.Cipher import Blowfish
+from Crypto.Util.Padding import unpad
+import time
+
+# define key and IV
+key = b'KEYKEYKE'
+iv = b'IVIVIVIV'
+
+size_handling = [100000, 500000, 1000000 ,5000000,10000000]
+
+for i in size_handling:
+    ciphertext = b'\xbf\x92\xfd\x9eV\xa7uU\xb7A\x87\xec_\xf0\xa7\xe7\x06k\xb5\x98\x89\xeb`\xaf2\x7f\xe3\xa2\x08z\x8f\xd9\x97\xd9$"\x9d\x15?\x05\xf0P@\x90B\xb9\x9a;' * i
+    t1 = time.time()
+    # create cipher object with Blowfish algorithm in CBC mode
+    cipher = Blowfish.new(key, Blowfish.MODE_CBC, iv)
+
+    # decrypt the ciphertext
+    decrypted_padding = cipher.decrypt(ciphertext) # decryption
+    plaintext = unpad(decrypted_padding, Blowfish.block_size) #remove padding 
+
+    t2 = time.time()
+    t3 = t2 - t1 #total time to decrypt according to file size
+
+    print(f'time taken to decrypt: {t3} for size bytes: {i}')
+    
diff --git a/blowfish2.py b/blowfish2.py
new file mode 100644
index 0000000..3a37ae0
--- /dev/null
+++ b/blowfish2.py
@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+import time
+from Crypto.Cipher import Blowfish
+from Crypto.Util.Padding import pad
+
+# define key and IV
+key = b'KEYKEYKE'
+iv = b'IVIVIVIV'
+
+# define data sizes to test
+size_handling = [100000, 500000, 1000000 ,5000000,10000000]
+
+# iterate over data sizes and test encryption time and data handling
+for i in size_handling:
+
+    message = b'Which witch switched the Swiss wristwatches?' * i
+    start_time = time.time()
+
+    # create cipher object with Blowfish algorithm in CBC mode
+    cipher = Blowfish.new(key, Blowfish.MODE_CBC, iv)
+    
+    padding = pad(message, Blowfish.block_size) #additional padding
+    ciphertext = cipher.encrypt(padding)# encrypting data
+
+    end_time = time.time()
+    total_time = end_time - start_time
+
+    print(f"Encryption time: {total_time} seconds for encrypted bytes: {i}")