#encryption

Encrypt your drive with BitLocker from the command line and get a recovery password.

Zip files with a password so only the recipient can open them.

The forgotten one-liner for password-protecting a single file without creating a zip archive: GnuPG's symmetric mode is built into every distro.

Create an encrypted zip with zip -e so only people with the password can open it.

Request and auto-renew Let's Encrypt certificates for your domains.

Password-protect any file with strong AES encryption before uploading or emailing it.

Encrypt your Mac's startup disk from the terminal using Apple's built-in fdesetup tool.

Encrypt a PDF with a user and owner password (AES-256) from the command line.

Create deduplicated, encrypted snapshots to local disks or cloud storage.

Generate browser-trusted certificates for local development hosts.

Keep passwords in a GPG-encrypted store and copy them on demand.

Once unlocked, a BitLocker data drive stays open — manage-bde -lock is the forgotten command that re-secures it without rebooting.