SecureStream 256 Pro — Offline AES-256 Encryption

100% offline · AES-256-GCM · Argon2id

SecureStream 256 Pro

Advanced file & folder encryption with authenticated AES-256-GCM, Argon2id password derivation or 32-byte key file, and metadata hiding. Full privacy, no telemetry.

⬇ Download (PL) ⬇ Download (EN)

📦 Full documentation (User Manual, Datasheet, EULA) is included inside the ZIP archive.

Overview

SecureStream 256 Pro is a privacy-first encryption utility for files and folders. It provides authenticated encryption with AES-256-GCM, password derivation via Argon2id, optional 32-byte key file, domain-separated HKDF labels, and early key validation (KCV). The app runs 100% offline with no telemetry; logs remain local.

AES-256-GCM

Authenticated encryption for confidentiality and integrity.

Argon2id / Key file

Password-based (Argon2id) or 32-byte key file authentication.

Hide metadata

Original name/extension stored only inside ciphertext.

Large files

Chunked processing (default 8 MiB) for stability and speed.

Zrzut ekranu — SecureStream 256 Pro

Quick start

  1. Open the app and select files/folders.
  2. Choose authentication: password (Argon2id) or 32-byte key file (.key).
  3. Optionally enable: Hide metadata, Backup, and extension filters.
  4. (Advanced) Adjust Argon2id (t/m/p) and Chunk size if needed.
  5. Click Encrypt or Decrypt and monitor progress.

Performance & tuning

Default chunk is 8 MiB (balanced). Larger chunks improve throughput on SSD/NVMe at the cost of RAM; smaller chunks reduce RAM usage on older devices. Recommended Argon2id defaults: t=3, m=128 MiB, p=4 (increase if resources allow).

Verification & requirements

  • Windows 10/11 x64 (min.); ≥8 GB RAM recommended for m=128 MiB
  • Release integrity (SHA-256)
    # PowerShell (Windows) Get-FileHash -Algorithm SHA256 “C:\path\SecureStream 256 Pro.exe”
    SHA-256 (EN): 39F59FF3EDEBB2A5D23C898959E8356DCEF00977D925D5A1FEEF0D2DAAD383C7 SecureStream 256 Pro EN.exe
    SHA-256 (PL): BADD4D62886744BBA46ABEACA6C4F931E0ED7167D23EF4C790A1F8E09DB3B031 SecureStream 256 Pro.exe

Technical basis: AES-256-GCM, Argon2id KDF, HKDF labels (AEAD/KCV/FILEKEY), KCV, metadata hiding, atomic write with fsync & replace, Unicode-safe I/O, fully offline.