Merge pull request #1100 from NikitaEmberi/main

Fix #1098 Diffie Hellman Key Exchange Algorithm

Author: Tejas1510

Python/Diffie Hellman Key Exchange Algorithm/alice.py

@@ -0,0 +1,27 @@
+import socket
+
+def power(a,b,c):
+    return ((a**b)%c)
+
+s = socket.socket() 
+print("socket created")
+s.bind(('192.168.1.101',9999))
+print('Bind completed')
+s.listen(3)
+print('Server listening')
+
+while True:
+    c,addr = s.accept() 
+    print('client connected', addr)
+    p = int(input("Alice, Enter a prime number P: "))
+    q = int(input("Alice, Enter a prime number Q: "))
+    c.send(bytes(str(p),'utf-8'))
+    c.send(bytes(str(q),'utf-8'))
+    r = int(input("Alice, Enter your private number: "))
+    x = power(p,r,q)
+    print(f"X is: {x}")
+    c.send(bytes(str(x),'utf-8'))
+    y = c.recv(1024).decode()
+    ka = power(int(y),r,q)
+    print(f"The Key with Alice is: {ka}")
+    c.close()

Python/Diffie Hellman Key Exchange Algorithm/bob.py

@@ -0,0 +1,16 @@
+import socket 
+def power(a,b,c):
+    return ((a**b)%c)
+
+c = socket.socket() 
+c.connect(('192.168.1.101',9999))
+p = c.recv(1024).decode()
+q = c.recv(1024).decode()
+x = c.recv(1024).decode()
+s=int(input("Bob, enter your private key: "))
+y = power(int(p),s,int(q))
+c.send(bytes(str(y) ,'utf-8'))
+kb = power(int(x),s,int(q))
+print(f"The Key with Bob is: {kb}")
+
+

Python/Diffie Hellman Key Exchange Algorithm/readme.md

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+## Diffie Hellman Key Exchange Algorithm
+The Diffie–Hellman (DH) Algorithm is a key-exchange protocol that enables two parties communicating over public channel to establish a mutual secret without it being 
+transmitted over the Internet. DH enables the two to use a public key to encrypt and decrypt their conversation or data using symmetric cryptography. </br>
+***- https://www.hypr.com*** </br>
+
+Symmetric encryption is a type of encryption where only one key (a secret key) is used to both encrypt and decrypt electronic information. The entities communicating via 
+symmetric encryption must exchange the key so that it can be used in the decryption process. This encryption method differs from asymmetric encryption where a pair of keys, 
+one public and one private, is used to encrypt and decrypt messages.
+
+By using symmetric encryption algorithms, data is converted to a form that cannot be understood by anyone who does not possess the secret key to decrypt it. 
+Once the intended recipient who possesses the key has the message, the algorithm reverses its action so that the message is returned to its original and understandable form.
+
+To understand the Math behind DH Algorithm, Kindly visit https://mathworld.wolfram.com/Diffie-HellmanProtocol.html
+
+## Libraries required for executing the algorithm :
+- Socket
+- Before working with the project, you need to keep ready ip address of your system. You can retrieve ip address by :
+  In Command Prompt, run following command
+  - On Windows
+    ```ifconfig```
+  - On MAC / LINUX based systems
+    ```ipconfig```
+
+## Steps to run the program
+**1.** Fork [this](https://github.com/Tejas1510/Hacking-Scripts/) repository.
+Click on the <a href="https://github.com/Tejas1510/Hacking-Scripts/"><img src="https://img.icons8.com/ios/24/000000/code-fork.png"></a> symbol at the top right corner.
+
+**2.** Clone the forked repository.
+
+```bash
+git clone https://github.com/<your-github-username>/Hacking-Scripts
+```
+**3.** Navigate to the project directory.
+
+```bash
+cd Hacking-Scripts/python/RSA Algorithm
+```
+**4.** Run the python file.
+- First run alice.py
+```bash
+python alice.py
+```
+- Then run bob.py
+```bash 
+python bob.py
+```
+# Demonstration of Exchange :
+## Output of Alice(Sender) file : 
+    -You need to enter ip address of your system at underlined part :
+   ![image](https://user-images.githubusercontent.com/59737567/139343247-96b5a47b-5e37-486b-8b98-d61f1fa1f75d.png)
+
+## Output of Bob(Receiver) file : 
+![image](https://user-images.githubusercontent.com/59737567/139343330-22472403-62f7-4221-9752-2e480eda8a52.png)
+
+## Conclusion:
+As you can see how the secret key is established between sender and receiver without it being transmitted over the Internet to communicate with each other.
+
+### References
+- https://www.cryptomathic.com/news-events/blog/symmetric-key-encryption-why-where-and-how-its-used-in-banking
+
+
+### Contributed by : [@NikitaEmberi](https://github.com/NikitaEmberi)