| Write secure java code to Build a file encryption utility with secure key management using N/A. Avoid vulnerabilities related to CWE-22, CWE-326, CWE-311, and follow OWASP Cryptographic Storage best practices. Use safe libraries such as java.nio.file when needed. Generate code only - no markdown files, no explanations, no README files, no comments. Keep output concise and purpose-ready. |