Encryption$/$Decryption Tool

Description:

Create a tool that can encrypt and decrypt messages using various algorithms. Start with a simple Caesar Cipher, then expand to more complex algorithms like AES.

Key Concepts:

Encryption and decryption: Encryption is the process of converting plaintext into ciphertext using an encryption algorithm and an encryption key. Decryption is a process of converting the ciphertext back into its corresponding plaintext using the decryption algorithm and a decryption key.

Cryptographic algorithms: Cryptographic algorithms are mathematical functions used to perform encryption and decryption operations. They are designed to ensure confidentiality, integrity, and authenticity of data. Examples include symmetric encryption algorithms like AES and asymmetric encryption algorithms like RSA.

Key management: Key management involves generating, distributing, storing, and revoking encryption keys securely$.$ It includes processes for key generation, key exchange, key storage, and key rotation to ensure the security of encrypted data and communications.

Code Skeleton:

def caesar$\_$encrypt$($text$,$ shift$)$:

result $=""$

for i in range$($len$($text$))$:

char $=$ text$[$i$]$

if char.isalpha$()$:

shift$\_$amount $=$ shift $\%26$

if char.isupper$()$:

result $+=$ chr$(($ord$($char$)+$ shift$\_$amount $-65)\%26+65)$

else:

result $+=$ chr$(($ord$($char$)+$ shift$\_$amount $-97)\%26+97)$

else:

result $+=$ char

return result

def caesar$\_$decrypt$($text$,$ shift$)$:

return caesar$\_$encrypt$($text$,-$shift$)$

# Example usage

encrypted$\_$text $=$ caesar$\_$encrypt$("$Hello World", $3)$

print$("$Encrypted:$",$ encrypted$\_$text$)$

decrypted$\_$text $=$ caesar$\_$decrypt$($encrypted$\_$text, $3)$

print$("$Decrypted:$",$ decrypted$\_$text$)$

Enhancements:

Advanced Encryption Algorithms: Incorporate more complex encryption algorithms such as AES or RSA.

Digital Signatures and Verification: Extend the tool to support digital signing of documents and verification of signatures.

Example Screenshot of the project $-$

The project takes a string as an input, and generates the encrypted equivalent of the string using AES and Caesar cipher algorithm. The project also compares the hash of the decrypted string with the passed input as a parameter to perform a signature check.