1.UserName 
2.Password 
3.EncType
CRYPT
MD5(*)
*recommented

AuthType Basic
AuthName Message
AuthUserFile Full-path.user
<Limit GET POST>
require user User-name
</Limit>

AuthName "Member Check"
AuthType Basic
AuthUserFile Full-path.user
AuthGroupFile Full-path.group
<Limit GET>
order allow,deny
allow from all
require group Group-name
</Limit>
[Full-path.group]
Group-name: User1, User2