XSigi Secure ZIP
The Secure ZIP helps you protect your ZIP file, allowing you to share or store it safely.
How to use
Upload your ZIP file. [example.zip] https://xsigi.com/documents/secure-zip
Choose a recipient — select someone from your Key Book or enter their public key.
Click “Create Secure ZIP.”
Download your new file [example.xsigi.zip] and share it with the recipient.
Only the chosen recipient will be able to open the Secure ZIP using their private key — not even you will be able to unlock it once it’s encrypted.
To decrypt the file, the recipient needs to upload it to: https://xsigi.com/documents/secure-zip/decrypt
Enter the private key password and click “Decrypt and download ZIP.”
We unseal your account’s private key with your password (in memory only). We open the sealed symmetric envelope key using your Curve25519 key. We decrypt the contents with ChaCha20-Poly1305 and send the ZIP file back to you.
Nothing is stored on the server.