Less than or equal to Attribute must be less than or equal to value. Any of the filters might be true. NOT None of the filters might be true. While the intent of the directory is to share much of the information in it across many applications, it must also be protected in order to prevent unauthorized access to sensitive data. Security within the directory is achieved using both authentication and access control.
Authentication identifies a user's credentials to the directory server.
Access control determines which entries a user is allowed to access based on that identity. Both of these topics are discussed next. A user establishes a connection to a directory server by performing a bind operation. Part of the information that is used in performing this operation is the user's identity and password. The simplest bind mechanism is an anonymous bind.