using mod auth_mysql with apache for authentication

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Hello, currently i have=A0 mod auth_mysql configured and running as pl=
aintext password: 1. how can i generate crypt_des passwords to store i=
n database?=0A2. how can i get a user log out once the browser tab is=A0 cl=
osed. seems i have to close the browser and reopen, then only i am presente=
d login box.=0A3. what password options are available for AuthMySQL_Encrypt=
ion_Types to use under ubuntu? thanks a lot. Rajeev=0A
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