Enigform

Enigform is a Mozilla Firefox extension that aims to enhance the HTTP protocol security by adding GnuPG Digital Signatures. This is particularly helpful for those requests made through GET, POST, and AJAX-generated POSTs. It works on sites requesting this level of security or all requests if so instructed.

Enigform's implementation is based on the white paper by Arturo Buanzo Busleiman called OpenPGP Signing for HTTP. The software provides a feature to digitally sign HTTP requests, even those generated through AJAX calls. Enigform acts as an extra layer of security for HTTP, focusing on security enhancement.

The cross-platform add-on is functional on Mac OS X, Linux, and Windows. Besides, Mozilla Thunderbird's Enigmail is another efficient extension for PGP capabilities. In conclusion, Enigform's digital signature mechanism adds to the HTTP security protocol, making it reliable and safer for the users.