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Neuron Encrypt

Local file encryption. No accounts. No internet. No compromise.
New in version 2.1.2
v2.1.2 — Fixed empty output files from Drive/cloud storage: the app no longer detaches the file descriptor before encryption finishes, so files from remote providers (e.g. Google Drive) come out intact instead of 0 bytes. Also enabled predictive-back navigation and bumped versionCode to 5.
Neuron Encrypt is a local file encryption app that keeps your files private. No accounts, no internet, no cloud — everything happens on your device.

Security
• AES-256-GCM-SIV (RFC 8452) — nonce-misuse resistant authenticated encryption
• Argon2id key derivation (256 MiB memory cost) — GPU/ASIC resistant
• HKDF-SHA512 key expansion with per-version domain separation
• VAULTX04 format with authenticated header (AAD on every chunk)
• 100% Safe Rust core — zero unsafe blocks in the crypto library
• Zero internet permissions, zero storage permissions (uses SAF)
• Keys and plaintext wiped from RAM with Zeroizing on drop

Features
• Encrypt any file to a .vx2 container
• Decrypt .vx2 files back to original
• Batch processing — queue multiple files with one passphrase
• Auto-detects encrypt vs decrypt mode from file magic bytes
• Cancel mid-operation (within one 1 MiB chunk)
• Password strength meter
• Secure wipe original file after encryption (with confirmation)
• Open source (GPLv3)

How it works
1. Select a file (or drop one from your file manager)
2. Enter a strong passphrase
3. Tap ENCRYPT — your file is encrypted to .vx2 beside the original
4. Optionally wipe the original file

Your passphrase never leaves the device. There is no recovery — if you forget the passphrase, your files are gone. This is by design.

Privacy
• No analytics, no tracking, no telemetry
• No network permissions in the APK
• No storage permissions (uses Android Storage Access Framework)
• No backup (android:allowBackup=false)
• Source code available at gitlab.com/theredhacker0345/neuron-encrypt

Technical specs
• Cipher: AES-256-GCM-SIV with BE32 streaming (1 MiB chunks)
• KDF: Argon2id (m=256 MiB, t=3, p=4, 64-byte output)
• RNG: OS CSPRNG (OsRng via getrandom)
• Min Android: 7.0 (API 24)
• ABIs: arm64-v8a, armeabi-v7a, x86_64, x86
  • app screenshot
  • app screenshot
  • app screenshot
  • app screenshot

Versions

Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.

Download F-Droid
  • Version 2.1.2 (5) suggested Added on Aug 12, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 7.0 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • run foreground service
      Allows the app to make use of foreground services.
    • run foreground service with the type "dataSync"
      Allows the app to make use of foreground services with the type "dataSync"
    • show notifications
      Allows the app to show notifications
    • com.neuronencrypt.app.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 3.3 MiB PGP Signature | Build Log

    • New in version 2.1.1
    v2.1.1 — CLI improvements: split run() into focused helpers, fixed unbounded stdin buffer, unified output validation, centralized JSON error emission, deterministic stream output path, documented progress reporter contract.
  • Version 2.1.1 (4) - Added on Aug 10, 2026

    arm64-v8a armeabi-v7a x86 x86_64

    This version requires Android 7.0 or newer.

    It is built and signed by F-Droid, and guaranteed to correspond to this source tarball.

    Permissions
    • run foreground service
      Allows the app to make use of foreground services.
    • run foreground service with the type "dataSync"
      Allows the app to make use of foreground services with the type "dataSync"
    • show notifications
      Allows the app to show notifications
    • com.neuronencrypt.app.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

    Download APK 3.3 MiB PGP Signature | Build Log

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