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SECURITY & CRYPTOGRAPHY WORKBENCH // NEXAVAULT v2.4

NexaVault Zero-Knowledge E2EE

Hardware-accelerated WebCrypto AES-256-GCM binary file sealing. Generate local .nexa encrypted vaults with embedded metadata headers or sync ciphertext directly to your personal Google Drive.

CIPHER: AES-256-GCM KDF: PBKDF2-SHA256 (250k) IV: 96-BIT CSPRNG
MODE: LOCAL OFFLINE VAULT
1. Select Source File to Seal 100% RAM-Streamed
Drop any file here or click to browse
Documents, archives, keys, images, or databases — never uploaded to any server
—
0 KB • MIME
SHA-256 INTEGRITY: computing...
2. Key Derivation Strategy NIST SP 800-38D
256-Bit CSPRNG Key MAX ENTROPY
Generates a random Base64URL cryptographic key string
Custom Passphrase PBKDF2 250K
Derives a 256-bit key from your password + 16-byte random salt
✔ CONTAINER SEALED IN RAM 0 KB
Decryption Key (Required to unlock this container):
—
Binary Container Telemetry WebCrypto API
Container Format
NEXA v2 Binary
Auth Tag Length
128-bit GCM
Nonce / IV Vector
96-bit Random
Throughput / Time
— ms
Session & Cloud Vault Index
Sealed containers from this session or linked Google Drive appear here for instant 1-click decryption.
Cryptographic Audit Log

Zero-Knowledge Client Execution

Engineered to run locally in your browser via native WebCrypto, WebUSB, and WebAssembly APIs without logging sensitive payloads on remote servers.

Deterministic Studio Output

Generates standards-compliant manifests, cryptographic containers, and unattended automation scripts ready for immediate production deployment.

Offline-Ready PWA Architecture

Once loaded, core workbench logic and cryptographic primitives operate seamlessly offline with zero external runtime dependencies.

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What is Client-Side Nexavault — Free Online Tool?
Client-side execution is a zero-knowledge processing model where operations run directly inside your web browser via WebAssembly and JavaScript engines. No files or personal data are ever uploaded to cloud servers, providing 100% data security and 0ms upload latency.
Why use offline browser processing instead of cloud upload services?
Offline local processing eliminates file size upload limits, waiting queues, and third-party data collection risks. It is compliant with strict enterprise data security standards including HIPAA, GDPR, and PCI-DSS.

Zero-Knowledge Execution Environment

Unlike cloud-based platforms that upload files to third-party servers, NexaTools operates 100% inside your browser memory via WebAssembly and modern browser APIs. Your data never leaves your device, eliminating data leak risks and guaranteeing absolute confidentiality.

Technical Processing Specifications

ComponentNexaTools (Client-Side)Legacy Cloud Services
Processing Boundary100% In-Browser (Client-Side)Remote Cloud Server
Data Transmission RiskZero (0 bytes transmitted)High (HTTP POST over WAN)
LatencyInstant (no upload wait)Dependent on upload speed
Software InstallationNone (browser only)App or plugin required
HIPAA Safe
No PHI transmitted
GDPR Compliant
Zero data collection
NDA Safe
Confidential data stays local

Encrypted File Vault — How NexaVault Works

NexaVault is a zero-knowledge encrypted file vault that lets you store files directly in your browser's IndexedDB storage. Unlike cloud storage services that host your files on remote servers, NexaVault keeps everything local — your files never leave your device and are encrypted before being stored.

End-to-End Encryption

When you upload a file to NexaVault, it is encrypted using AES-GCM (Advanced Encryption Standard with Galois/Counter Mode) — the same encryption algorithm used by banks and government agencies. The encryption key is derived from a passphrase you choose using PBKDF2 (Password-Based Key Derivation Function 2) with 100,000 iterations. Without your passphrase, the encrypted data is mathematically unreadable. NexaTools has no way to access your encryption key or decrypt your files.

Bring Your Own Cloud

NexaVault can optionally sync your encrypted vault to your own cloud storage using WebDAV (Web Distributed Authoring and Versioning). This means you can back up your encrypted files to a server you control — such as a self-hosted Nextcloud, a NAS device, or a cloud provider that supports WebDAV — while maintaining full end-to-end encryption. The cloud storage provider only sees encrypted data and cannot read your files.

Use Cases

NexaVault is ideal for storing sensitive documents like tax records, medical files, API keys, passwords, and personal identification documents. Because all processing happens client-side, it is suitable for environments where data cannot leave the device, including HIPAA-regulated healthcare settings and GDPR compliance scenarios.

Frequently Asked Questions

What does 'Bring Your Own Cloud' mean in NexaVault? ▼
Bring Your Own Cloud means NexaVault connects to your personal Google Drive storage via Google OAuth. NexaVault does not host your storage; your files remain within your own cloud account as encrypted blobs.
How does client-side zero-knowledge encryption work in NexaVault? ▼
Files are encrypted directly in your browser using AES-256-GCM before transmission. Only ciphertext is sent to Google Drive, ensuring Google and NexaTools cannot read file names, content, or metadata.
What happens if I lose my master encryption key in NexaVault? ▼
Because NexaVault is a true zero-knowledge system, your master key is never stored on any server. If you lose your encryption key, encrypted files stored in your Drive cannot be recovered or decrypted.
How do I decrypt and retrieve files previously uploaded to NexaVault? ▼
Connect your Google Drive account, provide the identical master encryption key used during upload, select the encrypted vault file, and NexaVault will decrypt and restore the original file locally in your browser.
Does NexaVault store or access my Google account credentials? ▼
No. Authentication occurs through Google's official OAuth 2.0 flow directly in your browser. NexaTools never receives or stores your Google password or authentication tokens on any server.

Related Tools & In-Depth Guides

Step-by-step tutorial: How to Use Free Browser-Based Tools for Privacy & Productivity

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