wzdftpd supports several authentication methods, and all of them are common to all backends.
This section explains which methods wzdftpd can use. For the moment, you cannot easily change auth method from SITE commands, but this will be implemented soon.
The default method is to store password in crypt() format, which is a variation of the Data Encryption Standard algorithm (DES) with variations.
To use the crypt format, the password is stored in backend encrypted. The first two chars constitute the salt (it is use to perturb the algorithm).
Passwords stored in crypt format are limited to 8 characters.