Opey CryptSecure

VERSION 2.4

CryptSecure

Ultra-Secure Text & File Encryption for Windows

Military-grade RSA + AES encryption. No cloud. No accounts. No tracking. Your data stays 100% on your computer, 100% under your control.

Download Free from Microsoft Store See How It Works User Guide

“This is how secure messaging SHOULD be: local, offline, user-controlled, impossible to intercept.”

✓
Zero Cloud Dependencies
✓
No Installation Required
✓
Works 100% Offline
✓
Free Forever
Capabilities

What CryptSecure Does

Fast, reliable, end-to-end encryption without the complexity of command-line tools or the risks of cloud-based apps.

TXT

Text Encryption

Encrypt and decrypt text messages with military-grade RSA + AES encryption. Perfect for sensitive communications.

FILE

File Attachments

Encrypt any file type — PDFs, documents, images, ZIPs, binaries. Drag-and-drop simplicity.

KEY

Key Management

Built-in Key Manager to create, import, export, and delete RSA keypairs. You control your keys.

AES

Passphrase Protection

Optional AES passphrase adds a second layer of protection. Multi-factor decryption capability.

OFF

100% Offline

No internet connection required. No servers, no accounts, no telemetry. Zero external communication — ever.

USB

Fully Portable

No installation needed. No registry changes. Run from USB drive or any folder. Take your encryption anywhere.

Professional-Grade Security

Enterprise-Level Cryptography

The same class of encryption used by governments, corporations, and forensic systems.

RSA Up to 4096 bits
AES-256 EAX Mode
PBKDF2 Key Stretching
Hybrid Multi-Layer Envelopes

How Encryption Works

Your Message + Files
→
AES-256 Encrypts Content
→
RSA Encrypts AES Key
→
Secure Envelope
Getting Started

How to Use CryptSecure

Simple, intuitive workflow for maximum security.

1

Create or Import Keys

Use the built-in Key Manager to create RSA keypairs (1024, 2048, or 4096 bits) or import existing keys. Your keys are stored in your chosen folder — you control the location.

2

Exchange Public Keys

Share your public key with anyone you want to communicate with. They share theirs with you. Public keys can be sent over any channel — even insecure ones.

3

Encrypt Your Message

Select the recipient’s public key, type your message, attach files if needed, add an optional passphrase, and click Encrypt. CryptSecure produces a secure encrypted envelope.

4

Send & Decrypt

Send the encrypted file via email, chat, or any method. Only the recipient’s private key can decrypt it. The transport channel doesn’t matter — zero-trust security.

i Need More Detail?

Our complete step-by-step guide covers setup, key exchange, encryption, decryption, and best practices.

Read the Full User Guide →
Use Cases

Who Uses CryptSecure

Trusted by professionals who need true offline encryption.

LAW

Attorneys & Legal Teams

Protect privileged communications and sensitive case files with client-controlled encryption.

INV

Investigators & Journalists

Secure sources, protect whistleblowers, maintain chain-of-custody for digital evidence.

BIZ

Corporate Teams

Share proprietary data, contracts, and strategic documents without relying on third-party services.

IT

IT Professionals

Test RSA workflows, secure credentials, protect configuration files and sensitive scripts.

MED

Healthcare & Finance

HIPAA and compliance-friendly encryption for patient records and financial documents.

YOU

Privacy-Conscious Users

Anyone tired of “free apps” that spy on you. True privacy without surveillance capitalism.

Why Choose CryptSecure

CryptSecure vs. Other Apps

A privacy app is only as strong as its architecture.

Feature CryptSecure Signal/WhatsApp
Works 100% Offline ✓ ✗
No Account Required ✓ ✗
No Server Dependencies ✓ ✗
User-Owned Key Storage ✓ ✗
Encrypt Any File Type ✓ ✗
Zero Telemetry/Tracking ✓ ✗
Portable (No Install) ✓ ✗
Questions

Frequently Asked Questions

Is CryptSecure really free? +
Yes, CryptSecure is completely free to download and use from the Microsoft Store. No subscriptions, no premium tiers, no hidden costs.
Does it require an internet connection? +
No. CryptSecure works 100% offline. It never connects to the internet, never sends data anywhere, and never communicates externally. Your encryption happens entirely on your device.
How do I share encrypted messages? +
First, exchange public keys with your recipient (this can be done over any channel — even insecure ones). Then encrypt your message using their public key and send the encrypted output via email, chat, file transfer, or any method you prefer. Only their private key can decrypt it.
What file types can I encrypt? +
Any file type — PDFs, Word documents, images, ZIP archives, executables, videos, spreadsheets, databases — anything. CryptSecure also supports encrypting entire folders (automatically zipped).
What if I lose my private key? +
If you lose your private key, messages encrypted with your public key cannot be decrypted — by anyone, including you. This is by design. We recommend backing up your private keys securely (e.g., encrypted USB drive stored safely).
Is this as secure as PGP? +
CryptSecure uses the same hybrid RSA + AES architecture as PGP and S/MIME. It supports RSA keys up to 4096 bits and AES-256 encryption. The main difference is CryptSecure is simpler to use — no command line required.

Download CryptSecure Free

Protect your messages. Protect your files. Protect your privacy.

Get CryptSecure from Microsoft Store

Windows 10/11 • No installation required • No account needed

© 2025 Opey’s IT. CryptSecure v2.4 Contact Privacy User Guide