LibreOffice supports symmetric and asymmetric encryption for OpenDocument Format (ODF) files.

Select File > Save/Save As

The "Save with password" option encrypts the file with AES-256.
The "Encrypt with GPG key" option encrypts the file with a public key.

Symmetric encryption: https://en.wikipedia.org/wiki/Symmetric-key_algorithm
Asymmetric encryption: https://en.wikipedia.org/wiki/Public-key_cryptography

Website: https://www.libreoffice.org
Mastodon: @libreoffice

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