SSL EncryptionSSL Encryption
SSL encryption (technically Transport Layer Security, but still commonly referenced as SSL, the acronym for its now deprecated predecessor) is a protocol for encrypting communications between a web browser and a web server. Encrypted connections (denoted by a web URL starting with 'https://') are not easily monitored by third parties unlike unencrypted connections (denoted by a web URL starting with 'http://'), where all content can be easily viewed by anyone with access to some part of the connection path. SSL works through a system of public-key cryptography, and is intended to not only keep communications private, but to also help ensure that you are actually communicating with the right server and not a hacker's rogue server that is merely impersonating a legitimate server.
By default, SSL is provided and available on OIT Webhosting, and can be enabled other types of on-campus web hosting where you or your information technology support staff have low-level management access to the web server.
In order to enable SSL encryption for a website, you need to have an SSL certificate that securely identifies that your server is the genuine server for your website's domain name. There are many possibilities for obtaining an SSL certificate – too many to list here.
Presently, Georgia Tech is a member of InCommon, a collective of universities which have pooled resources. This means campus units can get SSL certificates for free. Usually one person in a department, college and/or school has the ability to request and issue certificates. Ask your information technology support staff for assistance if you need a certificate for a web site.
InCommon Certificate Caveats
- Georgia Tech's InCommon account can issue certificates for sub domains of Georgia Tech (addresses that end in .gatech.edu) as well as non-Georgia Tech domains. If you need a certificate for a non-Georgia Tech domain, you will need to contact the InCommon admins who will assist with granting authority to sign the non-Georgia Tech domain, and provide instructions on verifying the ownership of the non-Georgia Tech domain. This is usually accomplished by uploading a unique key file to your site's docroot for verification.
- If your site is on OIT Web Hosting, you may not need a certificate, as web hosting has a 'wildcard' / multi-site certificate that covers a lot of common Georgia Tech sub domains, and they are often willing to add additional Georgia Tech sub domains if you ask. Please see the OIT FAQ Article on SSL Certificates and Web Hosting for more information.
- As of now OIT Web Hosting only allows creation of 2048 bit certificates. Most security standards now call for a minimum of 4096 bit SSL certificates.
Other Types of SSL Certificates
Before InCommon, there were several options for SSL certificates. You may stumble across them:
- Paid SSL certificates - Issued by GoDaddy, Thawte, Comodo and others.
- Self signed certificates - Generated and signed on the server that hosts them. These are fine for development, but should never be used in production, as users will get a certificate error message in their browser when accessing a site with a self-signed certificate.
- Georgia Tech Signed certificates - For many years, Georgia Tech had its own root certificate. It's no longer used, but may still be on systems. If you find this, you should remove it, as the root certificate has expired, as have any certificates signed by that root certificate.