Cryptography

Python Implementation for some cryptographic algorithms
Here's a broad description of the cryptography techniques given

Symmetric Key Cryptography Techniques

• 1 Substitution ( each character is substituted with another, can be a different space than the plaintext )

  • 1.1 Monalphabetic ( every character is substituted to the same character, no matter the position )

    • 1.1.1 Additive Cipher ( aka Shift, Caesar )
    • 1.1.2 Multiplicative Cipher
    • 1.1.3 Affine Cipher

  • 1.2 Polyalphabetic Cipher ( the value of the substituted character depends on both its value and it's position )

    • 1.2.1 Autokey Cipher
    • 1.2.2 Playfair Cipher
    • 1.2.3 Vignere Cipher
    • 1.2.4 Hill Cipher

• 2 Transpostion ( The orders of the characters is interchanged )

  • 2.1 Keyless Transposition
  • 2.2 Keyed Transposition

• 3 Modern Symmetric Ciphers

  • 3.1 Data Encryption Standard ( DES )
  • 3.2 Advanced Encryption Standard ( AES )

Asymmetric Key (Public Key) Cryptography Techniques

• 1. Rivest, Shamir, Adleman ( RSA ) Cryptosystem
• 2. Rabin Cryptosystem
• 3. Merkle-Hellman Knapsack Cryptosystem
• 4. El-Gamal Cryptosystem
• 5. Elliptic Curve Cryptosystem

How to use?

Clone the repository and you can use the symmteric_crypto class in your script.
You can directly run the RSA and Knapsack crypto algorithms by typing:

python <name_of_the_file>.py

TO DO:

• Add support for Python 3.x
• Add support for C/C++