# Security Modules

Security modules are third-party programs that allow Mosaic to communicate with secure servers using various security protocols. Since different applications (banking, education, etc.) require different levels of security, multiple security modules may be installed. Once a security module is installed, it is ready to use.

When Mosaic accesses a secure server, it activates the security module required by that server. If the required module is not installed on your system, you will need to obtain the correct module. Security modules and instructions for installing and configuring modules should be available from servers that require that module.

To list the security modules installed on your system:

- From the Edit menu, choose Security.

  The following modules are pre-installed:

  - First Virtual
    Supports an Internet payment system from First Virtual Holdings Inc.

  - Digest Authentication
    Uses MD5-encrypted passwords for authorization to receive an HTTP reply.

  - Basic Authentication
    A basic, non-secure protocol supported by nearly all WWW servers. A user name and password are sent to the server in UUENCODED form. This method can be used to limit access to a server.

More information about Mosaic's security framework is available.

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