Encryption System Design Based On DES And SHA-1

Implementation of the paper https://ieeexplore.ieee.org/document/6385298 by Jian Zhang, Xuling Jin

Course:

Number Theory and Cryptography (CO313)

Contributors:

• Dibyadarshan Hota (16CO154)
• Omkar Prabhu (16CO233)

System Design

• 3_DES in CBC mode

Installation

$ pip3 install pycrypto

Usage

0. RSA Public-Private key gen

$ cd decryption
$ python3 rsa.py

1. Encryption

$ cd encryption
$ python3 sha1_rsa_3des.py

2. Decryption

$ cd decryption
$ python3 decryption.py

File Structure

• encryption/sha1_rsa_3des.py - Contains encryption code for the system
• decryption/rsa.py - Generated Public and Private keys
• decryption/decryption.py - Contains decryption code for the system
• decryption/private_key.pem - Private key generated by decryption.py
• public_key.pem - Private key generated by decryption.py
• results/ - Contains screenshots of results
• paper.pdf - Research Paper
• decryption/message.txt - Decrypted message
• cipher.txt - Cipher text + SHA1 Hash
• enc_key.txt - Encrypted Keys for 3DES
• iv.txt - Initial vector required for 3DES

Results

RSA Key Generation

Plaintext

Encryption

Encrypted Files

Decryption