Hello Adventurers! Today we embark on a mysterious journey to explore the secrets of data encryption!

📝 Mission Briefing

• Difficulty: ⭐⭐⭐⭐
• Objective: Master data encryption skills
• Estimated Duration: 45 minutes
• Initial Equipment: Python 3.x

Level 1: Beginner Village – Acquiring Basic Equipment

🎯 Beginner Task: Install PyCrypto

# Install basic equipment
pip install pycryptodome  # Note: We use pycryptodome, which is a replacement for pycrypto

# Import necessary spells
from Crypto.Cipher import AES
from Crypto.Random import get_random_bytes
from Crypto.Util.Padding import pad, unpad

✅ Beginner Achievement Unlocked:

• Environment configured
• Basic module imported successfully
• Initial encryption equipment obtained

Level 2: Intermediate Dungeon – AES Encryption Secrets

⚔️ Core Equipment: AES Encryption

• Base Attribute: 128-bit key
• Enchanting Effect: Data Security +80%
• Enhancement Suggestion: Use CBC mode

class SecretKeeper:
    def __init__(self):
        self.key = get_random_bytes(16)  # Generate a mysterious key
        
    def encrypt_message(self, message: str) -> bytes:
        cipher = AES.new(self.key, AES.MODE_CBC)
        message_bytes = message.encode('utf-8')
        cipher_bytes = cipher.encrypt(pad(message_bytes, AES.block_size))
        return cipher.iv + cipher_bytes  # IV + Ciphertext
    
    def decrypt_message(self, encrypted_data: bytes) -> str:
        iv = encrypted_data[:16]  # Extract initialization vector
        cipher_bytes = encrypted_data[16:]  # Extract ciphertext
        cipher = AES.new(self.key, AES.MODE_CBC, iv)
        decrypted = unpad(cipher.decrypt(cipher_bytes), AES.block_size)
        return decrypted.decode('utf-8')

🎮 Dungeon Drops:

• AES encryption skill
• Mastery of CBC mode
• Key management capability

Level 3: Elite Monster – Common Traps and Solutions 🐛

# This is a trap! Don't do this!
def unsafe_encryption(message, key):
    # ❌ Using a fixed IV is very dangerous!
    iv = b'0000000000000000'
    cipher = AES.new(key, AES.MODE_CBC, iv)
    return cipher.encrypt(pad(message.encode(), AES.block_size))

# Correct approach
def safe_encryption(message, key):
    # ✅ Use random IV
    cipher = AES.new(key, AES.MODE_CBC)
    cipher_bytes = cipher.encrypt(pad(message.encode(), AES.block_size))
    return {
        'iv': cipher.iv,
        'ciphertext': cipher_bytes
    }

💡 Battle Experience:

• Always use a random IV
• Properly safeguard keys
• Be mindful of padding methods

Level 4: Team Dungeon – Encrypted File System

class SecureFileSystem:
    def __init__(self, master_key: bytes):
        self.master_key = master_key
    
    async def encrypt_file(self, filename: str) -> None:
        cipher = AES.new(self.master_key, AES.MODE_CBC)
        
        async with aiofiles.open(filename, 'rb') as f:
            data = await f.read()
        
        encrypted_data = cipher.encrypt(pad(data, AES.block_size))
        
        async with aiofiles.open(f'{filename}.encrypted', 'wb') as f:
            await f.write(cipher.iv + encrypted_data)
            
        return {"message": "File encrypted successfully!", "achievement": "Encryption Expert"}

🏆 Team Dungeon Achievements:

• Mastery of file encryption
• Expertise in asynchronous processing
• Implementation of secure storage

Final Boss: Hybrid Encryption System 🔥

from Crypto.PublicKey import RSA
from Crypto.Cipher import PKCS1_OAEP
from Crypto.Cipher import AES

class HybridCrypto:
    def __init__(self):
        # Generate RSA key pair
        self.key = RSA.generate(2048)
        self.public_key = self.key.publickey()
        
    def encrypt_large_file(self, data: bytes) -> dict:
        # Generate session key
        session_key = get_random_bytes(16)
        
        # Encrypt session key with RSA
        cipher_rsa = PKCS1_OAEP.new(self.public_key)
        encrypted_session_key = cipher_rsa.encrypt(session_key)
        
        # Encrypt data with AES
        cipher_aes = AES.new(session_key, AES.MODE_CBC)
        encrypted_data = cipher_aes.encrypt(pad(data, AES.block_size))
        
        return {
            'encrypted_session_key': encrypted_session_key,
            'iv': cipher_aes.iv,
            'encrypted_data': encrypted_data
        }

🎮 Ultimate Achievement Unlocked!

• Mastery of hybrid encryption
• RSA asymmetric encryption
• Large file handling capability

Adventure Summary 📝

🏆 Achievements Unlocked:

• Symmetric encryption expert
• Asymmetric encryption master
• Security protocol expert
• Key management guru

⚠️ Important Notes:

• Keys must be securely stored
• IV must be randomly generated
• Properly handle padding

🔮 Future Skill Tree:

• Support for national cryptographic algorithms
• Hardware encryption modules
• Blockchain encryption technology

Adventurers, today’s encryption dungeon comes to an end! If you found it rewarding, don’t forget to give a thumbs up!

Do you have any interesting encryption experiences? Feel free to share your stories in the comments!

PS: Follow me for more advanced Python secrets! Next time we will explore more mysteries of encryption! 🎮

#Python #Encryption #Security #ProgrammingTutorial