Security

Allows a node to generate a password for itself that users must enter into their profile to be able to see that node.

The idea is that someone who has access to the node anyway (e.g., because of their user role) will be shown the password which they can then give to somebody else in person.

This module is incomplete. Nodeaccess Userreference is what you should use.

This module does not protect your site's file integrity. Only you can do that by configuring the site correctly and by not installing insecure software.

This module will encrypt outgoing mail your Drupal site if the recipient has uploaded a GPG key to the profile.

Both profile module and user fields will be supported.

The Anonymous Publishing module increases your control over anonymous
publishing on a site.

Allowing anonymous publishing may lower the threshold for authorship and entry to a site. Sites that deal with sensitive issues may want to provide their users with the ability to publish anonymously.

Cipher is purely a generic API to encrypt and decrypt data. One should only need to install this module if it is asked for by another module as a dependency.