WinTrezur uses CBC encryption mode. A unique encryption key is generated from the password for each different encrypted archive file entry. Encrypting the same data with the same password always results in different encrypted output. This means, with regard to bruteforcing of encryption key, it is fully safe to use same password to encrypt all of your files. However sometimes, you may want to have some more security around your password, which is the weaker point on the chain.
Several ways exist to come up with strong encryption passwords. The following describes one of them. It is a two step password method, based on having a master password which is same all the time and you can remember and a changing (one-time) password which you can change based on what you are encrypting (salt).
When prompted to enter a new password in WinTrezur, open the password options menu, and select [Text Editor] (or press Ctrl + E).
[Open Text Editor from Password Dialog]
In the Text Edit enter the unique password to use for the archive. It does not need to be complicated, but it must be different from master password, and must change as needed. For example, write 'filename simplepass' as text.
[Enter simple password in Text Editor]
Select [Options / Base64 / Encrypt] menu (or from toolbar) and when prompted to enter a password, enter you master password (make sure you use always same encryption settings for the master password).
[Enter master password]
The original text is then encrypted with the master password and base64 encoded. The base64 text is multi-line. To convert it to a single line use [Transform / Join Lines] menu (do not forget this step).
[Encrypted Base64 Text (multi-line)]
If [Options / Wrap Text] is checked than the text may still show in multiple lines, however, it is still physically a single text line.
[Join lines of Base64 Text (single-line)]
This is your password to use. Select all text (Ctrl+A) and [Copy] it in clipboard.
[Copy text and passte in password window to use as password]
Close the Text Editor and paste the password in original password dialog.
Repeat same steps everytime you need to open the archive.
The master password and the one-time passwords do not need to be too complicated for this method to be safe. You use simple ones you can easy remember. Never write the master password. You can even share same master and one-time password between several archives as needed.