* **Removed:** `import random`
* **Added:** `import secrets`
* **Added:** `from functools import lru_cache`
* **Added:** `lock = threading.Lock()`
* **Added:** `counter = 0`
New Features:
* Implemented a robust security foundation with new exception classes:
* `SecurityError`: Base exception for security-related errors.
* `InputValidationError`: Raised when input validation fails.
* `AuthorizationError`: Raised when authorization checks fail.
* `SanitizationError`: Raised when data sanitization fails.
New Class:
* **RateLimiter** :
* Implements rate limiting to prevent DoS attacks.
* Supports`max_calls` and`time_window` configuration.