implementing-aes-encryption-for-data-at-rest

The code is a conventional local file encryption utility and contains no evident malicious behavior, network exfiltration, backdoor, or destructive payload. The primary security issue is path traversal during directory decryption because output paths are not confined to output_dir. Large-file memory usage, command-line password exposure, and input/output directory overlap are additional operational risks. Directory decryption should reject absolute paths and any resolved destination outside the target directory.