Cookies

cookie name	purpose
DW<hash>	Used for authentication after login. This holds the necessary data to (re)login a previously authenticated user
	Importance:	necessary for anyone who needs to log in
	Typical content:	encrypted username and password
	Expires:	in a year ¹⁾

DOKU_PREFS	Used for remembering helpful user preferences, like the size of the editor textarea.
	Importance:	functional
	Typical content:	name/value pairs in plain text
	Expires:	in a year

DokuWiki	The standard PHP session identifier. Used to hold temporary data and to avoid CSRF attacks.
	Importance:	necessary
	Typical content:	random ID
	Expires:	at the end of the browser session

¹⁾

if “Remember me” was checked when logging in, otherwise: at the end of the browser session