Implementation of Symmetric Cipher Algorithms: AES and RC4

🔐 AES (Advanced Encryption Standard)

• Block cipher: encrypts data in 128-bit blocks
• Key sizes: 128, 192, and 256 bits
• Secure and efficient for various applications

🔐 RC4 (Rivest Cipher 4)

• Stream cipher: encrypts data in a continuous stream
• Variable key size (40–2048 bits)
• Fast but has known security vulnerabilities

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AES and RC4 Encryption in Python

This repository provides simple Python implementations of:

1. AES (ECB mode) using pycryptodome
2. RC4 stream cipher implemented from scratch

Features

• AES encryption and decryption with padding
• RC4 encryption and decryption using KSA and PRGA