CryptSecure Demo
See Quantum-Safe Encryption in Action
Drop a message and a file below, then watch CryptSecure build a quantum-safe envelope — layer by layer. This is exactly what happens inside the real app on your Windows device.
Click or drop a file here
Any file type · Up to 1 MB
Encryption Stage
● IdleEnter a message and (optionally) attach a file, then click Build Secure Envelope to see the encryption flow.
This is a visual demonstration. Real CryptSecure encryption runs entirely offline on your Windows device with the same NIST-standardized algorithms.
The Five Steps to a Quantum-Safe Envelope
Each layer adds a distinct kind of protection. Together they produce a single encrypted file that’s safe to send through any channel.
Bundle
Your message and attached files are packaged together as one plaintext bundle.
AES-256-GCM
The bundle is encrypted with a fresh random AES-256 key — authenticated, tamper-evident.
RSA-4096
The AES key is wrapped with classical RSA-OAEP — the proven workhorse of today’s encryption.
ML-KEM-1024
A post-quantum layer is added — NIST FIPS 203 algorithm resistant to future quantum attacks.
Envelope
Everything is sealed into one secure envelope file. Only the recipient’s private key can open it.
Ready to Try the Real Thing?
CryptSecure runs entirely offline on Windows 10/11. Free forever.
Windows 10/11 · No account needed · 100% Offline
Or download the previous version (v2.4.3) →