# Self-Destructing Chat Application
This application concept implements a secure chat system with self-destructing messages that cannot be recovered, traced, or decrypted after expiring.
Key features:
- End-to-end encryption using a strong algorithm like AES-256
- Messages are stored only in volatile memory (RAM), never written to disk
- Messages have a configurable expiration time
- Upon expiration, messages are securely wiped from memory
- No message logs or backups are kept
- Clients generate new encryption keys for each session
## High-level implementation:
```python
import secrets
from cryptography.fernet import Fernet
import time
class SecureChat:
def __init__(self):
self.encryption_key = Fernet.generate_key()
self.fernet = Fernet(self.encryption_key)
self.messages = []
def send_message(self, message, ttl=60):
encrypted = self.fernet.encrypt(message.encode())
self.messages.append({
'content': encrypted,
'expires': time.time() + ttl
})
def read_messages(self):
current_time = time.time()
valid_messages = []
for msg in self.messages:
if msg['expires'] > current_time:
decrypted = self.fernet.decrypt(msg['content']).decode()
valid_messages.append(decrypted)
else:
# Securely wipe expired message
msg['content'] = secrets.token_bytes(len(msg['content']))
# Remove expired messages
self.messages = [msg for msg in self.messages if msg['expires'] > current_time]
return valid_messages
# Usage
chat = SecureChat()
chat.send_message("This message will self-destruct in 60 seconds")
print(chat.read_messages())
time.sleep(61)
print(chat.read_messages()) # Message is gone
```
This basic implementation demonstrates the core concepts. A production version would need additional security measures, proper key management, and a client-server architecture.
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