ODF wholesome encryption is the default password (symmetric) encryption mode in LibreOffice 24.8.
Supports AES-256-GCM and Argon2id.
LibreOffice 24.2/24.8 is required to open the encrypted files.
Disable: Tools > Options > Load/Save > General > ODF Format Version > 1.3 (drop down menu) > Apply > OK
AES: https://en.wikipedia.org/wiki/Advanced_Encryption_Standard
GCM: https://en.wikipedia.org/wiki/Galois/Counter_Mode
Argon2: https://en.wikipedia.org/wiki/Argon2
Website: https://www.libreoffice.org
Mastodon: @libreoffice
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