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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

  1. RSA Public-Private key gen
$ cd decryption
$ python3 rsa.py
  1. Encryption
$ cd encryption
$ python3 sha1_rsa_3des.py
  1. 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