# B.TECH FINAL YEAR PROJECT

Final Year Project for Communication system security.

Communication security Project involving Different ciphers and Diffie Hellman key exchange Algorithms.

Diffie Hellman Key Exchange allows two groups upon sharing a secret numbers and symmetric key though insecure communication channel or medium.

The benefit of using a symmetric key over public key cryptography lies in the fact that encryption of a plaintext message into a ciphertext message and decryption of the ciphertext message back to the original plaintext message happens much faster using a symmetric key.

Three Layer of Security as follows are:

1. Diffie Hellman exchange Algorithm
2. Vignere Cipher
3. Polybius cipher

Very Secure, Complex and confidential system.

Code :

Step 1: Implementation of Diffie Hellman key Exchange Algorithm.

`# use Python 3 print function# this code ensures that the print function works the same in Python 2.x and 3.xfrom __future__ import print_function# Variables UsedP = int(input(' Please enter the value of P.'))print('  Thanks for entering the value of P as ' + str(P))g = int(input(' Please enter the value of g.'))print('  Thanks for entering the value of g as ' + str(g))a = int(input(' \n Please enter the value of a.'))b = int(input(' Please enter the value of b.'))# A1 Sends B2 A = g^a mod PA = (g**a) % Pprint( "\n  A1 sends over to B2: " , A )# B2 Sends A1 B = g^b mod PB = (g ** b) % Pprint( "  B2 sends over to A1: " , B )# A1 computes the Shared Secret: S_A1 = B^a mod PA1SharedSecret = (B ** a) % Pprint( "    \n  A1 Shared Secret: ", A1SharedSecret )# B2 computes the Shared Secret: S_B2 = A^b mod PB2SharedSecret = (A**b) % Pprint( "  B2 Shared Secret: ", B2SharedSecret )`

Step 2: Vignere Cipher Process

Step 3: Polybius Cipher Process

Step 4: Output (Encrypted)

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