Keeping a diary is risky. People no longer write their diaries on paper. A diary written on paper can fall into someone else's hands. Therefore, this action poses quite a risk. That's why people now write their diaries in notebooks on their phones. There are also those who put their heart on paper in another way.
There will be those who want to read that diary after many years and laugh and think. It is best not to keep paper diaries, as there is always a risk of being read by someone else.
The encrypted diary is also clever, but what if we can't decipher it in the next years?