The original title is "Building a Python File Encryption Tool: Lessons from Beginner Bugs"

Short summary

A cybersecurity beginner built a Python file encryption tool using Fernet (AES-128 + HMAC) and documented the bugs encountered along the way. Key lessons include avoiding circular imports, reading conditionals carefully to prevent silent key destruction, and designing for failure by never overwriting original files. The project demonstrates practical security thinking through modular architecture and key management.

• •Built a Python file encryption tool using cryptography library's Fernet symmetric encryption
• •Encountered and fixed critical bugs: circular import, inverted if/else that would silently destroy keys, unreachable code after return
• •Key design decision: always write new encrypted files rather than overwriting originals to prevent data corruption on failure

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