EncryptEngine – RSA & AES Encryption Utility
A free, offline Windows tool for encrypting and decrypting text and files using industry-standard RSA and AES cryptography. Built for developers, IT professionals, and anyone who needs real encryption — not just encoding — without data ever leaving their machine.
Download EncryptEngine v1.0
Free on the Microsoft Store — no subscription, no ads.
Features
🔑 RSA Key Pair Generation
On startup, EncryptEngine automatically generates your RSA public/private key pair using the Windows CryptoAPI. Your public key is ready to share immediately for secure key exchange.
🔄 Secure Session Key Exchange
Generate a random AES-256 session key and encrypt it with another user's RSA public key. Share the encrypted session key safely over any channel — only the holder of the matching private key can unwrap it.
📝 Text Encryption
Encrypt any text using your own RSA key, a pasted RSA public key, an AES session key, or a password. Password-based encryption uses a random 16-byte salt stored alongside the ciphertext so decryption is always reliable.
🔓 Text Decryption
Decrypt ciphertext using your RSA private key, an AES session key, or a password. The app automatically extracts the embedded salt from password-encrypted messages and reconstructs the exact key used at encryption time.
📁 File Encryption
Encrypt any file using your RSA key, a pasted RSA public key, an AES-256 session key, or a password. Files are processed in streaming blocks — no full load into memory — with a real-time progress bar for large files.
📂 File Decryption
Decrypt any encrypted file. For password-encrypted files, the app reads the 16-byte salt header written during encryption and automatically reconstructs the correct key — no manual salt entry needed.
🔐 4 Key / Auth Modes
Every encrypt/decrypt operation supports four flexible key modes: your own RSA key, a pasted RSA public key, an AES session key, or a password — covering both asymmetric and symmetric workflows.
🔒 Fully Offline & Private
No internet connection required. All cryptographic operations run entirely on your machine using the native Windows CryptoAPI. Your keys, text, and files never leave your computer.
Common Uses
📨 Secure Message Exchange
Share your RSA public key, receive an encrypted session key from the other party, and use it to decrypt messages — a practical end-to-end encrypted messaging workflow without needing a server.
🗄️ Protecting Sensitive Files
Encrypt confidential documents, backups, or archives with AES-256 or RSA before storing them on cloud drives, USB sticks, or shared servers.
🧑💻 Developer & Security Testing
Test RSA and AES encryption workflows, validate key exchange implementations, or prototype cryptographic protocols — all from a visual desktop interface without writing code.
🔑 Password-Based Encryption
Encrypt text or files with just a password — no key management required. Salted key derivation ensures the same password produces a unique key every time, protecting against rainbow table attacks.
Screenshots
Main Application Interface
RSA Key Exchange
Text Encryption
Text Decryption
File Encryption
File Decryption
Latest Release
Version 1.0 — January 2026
Initial release — RSA & AES encryption, 4 key modes, text & file encryption, fully offline.