Flash Vault

Flash Vault is a privacy-first web-based application designed for secure and temporary sharing of encrypted messages and files. The system uses client-side encryption to protect user data before it is transmitted to the server. It implements AES-256-GCM through the Web Crypto API to provide confidentiality and data integrity. The application follows a zero-knowledge architecture where the server stores only encrypted data and never receives the encryption keys or plaintext content. Encryption keys are maintained in the URL fragment, keeping them separate from server requests. Users can share text and files up to 20MB through secure, temporary links. The system supports burn-on-read functionality and automatic expiration to ensure shared data is securely removed after use. It also incorporates temporary storage, automated cleanup, and rate limiting to improve security and prevent misuse. The primary objective of Flash Vault is to provide a simple, secure and privacy-focused solution for sharing sensitive information without permanent data storage.