This article on msdn indicates it's a new feature in SQL Server 2008. To me that means it's not available in 2005.
There are a lot of resources available with step-by-step guides for other data encryption types in 2005, though. I think it's probably beyond the scope of a question on a Q&A site, however.
Since you are using Standard Edition, you cant use TDE. So other options are
Using encryption keys at instance/database level :
SQL Server has two kinds of keys: symmetric and asymmetric. Symmetric keys use the same password to encrypt and decrypt data. Asymmetric keys use one password to encrypt data (called the public key) and another to decrypt data (called the private key).
SQL Server has two primary applications for keys: a service master key (SMK) generated on and for a SQL Server instance, and a database master key (DMK) used for a database.
Also, you can have encryption at column level by creating a MASTER KEY ENCRYPTION along with CREATE CERTIFICATE and then CREATE SYMMETRIC KEY.
An example of how this can be done is described at Encrypt a Column of Data
Reference : SQL Server and Database Encryption Keys (Database Engine)
At Drive level :
Using BitLocker as it is a Drive Encryption data protection feature available Windows Server 2008 R2. Refer to : BitLocker Drive Encryption Overview There are many opensource or third party software to do the same job but at additional cost.
Note: The most important bit is ALWAYS backup your encryption keys.
You can use third party software like Redgate's sql backup which allows you to encrypt backups using passwords.
Depending on what level you need encryption will determine if it is worth upgrading to enterprise edition or not. You have to evaluate native TDE encryption vs encryption keys and certificates vs open source vs disk encryption.
Best Answer
We have quite some mixed servers, using encryption, depending upon the need of business. For very critical servers, we decided to upgrade to Enterprise edition as it not only provides TDE but other benefits as well when it comes to performance or troubleshooting.
Yes, TDE is quite effective and very good, but since it comes with a cost we decided for medium and low priority businesses to use a third party tool like NetLib.
I would like to highlight a few of its benefits, per our usage:
masterdatabase and thetempdbdatabase.I have not heard much about DbDefence, but yes I believe it supports Replication, Log Shipping and Mirroring. Read here for more info.
I believe you can have a trial of the above products and decide as per the business needs which suits your environment the best.