Security

This module allows user to move content (nodes) to trashbin. It inserts "Move to trash" button on node edit page, for users who have permission to move this node to trash.
What is trashbin then ? It's for you to decide. This module was made as simple as possible, providing minimal interface on it's own, but serving as bridge module for other modules at the same time. It provides hook which is invoked when user presses "Move to trash" and confirms the action.

This module became obsolete, because Flag module now has access control built-in. You can do same things with the Flag module

This module allows you to set up access to the site on base of request referrer, remote IP address or User Agent with reverse-lookup check of domain name (for searchbots)

Cron Key is a module that adds various utility functions for the Drupal cron system. As of July 29, 2013, this project is under new maintainership.

AntiSpam module is the successor of the Akismet module, and it provides spam protection for your Drupal site using the Akismet anti-spam service.

OpenPGP is the most widely-used e-mail encryption standard in the world. Originally derived from PGP (Pretty Good Privacy), first created by Phil Zimmermann in 1991, the standard is now defined by the IETF in RFC 4880.

This module provides encryption for Drupal's outgoing e-mails using GNU Privacy Guard, an open-source implementation of the OpenPGP standard.

TimeCert is a web service for timestamping content. This provides evidence by a trusted third-party that something (e.g. a blog post, a document, or a file) existed at a given time. TimeCert records and gives you the timestamp for when someone first referenced a given digital fingerprint.