If you wish to keep a document private, you can use Simredo's encryption function.
First, open or create the document which you wish to encrypt. Next select 'Save as' from the File menu. The dialogue at right will appear. Select Encrypted from the list and click on OK.
Simredo will ask you to enter an encryption key, which is a password or
sentence. This key must be at least 8 characters long. Type the same
key into both text fields. If they are not the same, encryption will
not succeed.
After you've typed in the key, click on OK. The 'Save File' dialogue will appear. Enter the file's name and save it. (You should overwrite the unencrypted original.)
When you open an encrypted file, Simredo automatically recognizes that the file is encrypted, and displays the dialogue at right. Type in your key word or sentence and click on OK. Your original document will appear.
NB: Your key must be exactly correct, and upper and lower case matters. For example, if you use the key 'Jar Jar Binks' to encrypt a file, you cannot decrypt it with 'jar jar binks'.
If you are interested in the encryption algorithm, there is a description here.