An implementation of an encryption technique using Fibonacci Series for file encryption over the entire ASCII range of characters.

It accepts the following command line arguments -

1. Method: Denotes the program mode - Encryption (e) or Decryption (d).

• python Fibonacci-Encrpytion.py --method e
• python Fibonacci-Encrpytion.py -m e
• python Fibonacci-Encrpytion.py --method d
• python Fibonacci-Encrpytion.py -m d

2. Input File Path: Denotes the path to file to be encrpyted.

• python Fibonacci-Encrpytion.py --input encryptMe.txt
• python Fibonacci-Encrpytion.py -i encryptMe.txt

3. Output File Path: Denotes the path to output file that will hold the encrypted text.

• python Fibonacci-Encrpytion.py --output encryptedText.txt
• python Fibonacci-Encrpytion.py -o encryptedText.txt

4. Password: Encryption key/password required to encrypt or decrypt the file.

• python Fibonacci-Encrpytion.py --password MyP@ssword123456
• python Fibonacci-Encrpytion.py -p MyP@ssword123456

ALGORITHM USED -

ENCRYPTION:

• Generate fibonacci series equal to length of password.
• For each word in the text
  • Reverse the word.
  • Add password to end.
  • For each value in fibonacci series
    • For each character is word
      • if index is even, the character is reversed by 'value'. Ex - value - 3, character - 'b', then cipher - 'z'
      • if index is odd, the character is forwarded by 'value'. Ex - value - 3, character - 'b', then cipher - 'e'
    • Update word.

DECRYPTION:

• Generate fibonacci series equal to length of password.
• For each word in the text
  • For each value in fibonacci series
    • For each character is word
      • if index is odd, the character is reversed by 'value'. Ex - value - 3, character - 'b', then cipher - 'z'
      • if index is even, the character is forwarded by 'value'. Ex - value - 3, character - 'b', then cipher - 'e'
    • Update word.
  • Validate Password by checking end of word.
    • If password is correct,
      • Remove the password from end.
      • Reverse the word.
    • Else, exit