Encryption techniques

I've been trying to solve a series of puzzles that appear to be using different encryption techniques. Not knowing much about them, I'm wondering if anyone here knows of a site that outlines some of the more common used techniques.

I've found a number of sites, but they all more or less show how a key is used to encrypt/decrypt. I'm not so sure there is a key involved with this one, or at least I don't know how to go about finding it.

Here's the string:

R0X0W7X0M0S6830S08Q6SR2W216QQVV

The last puzzle was a Bifid Cipher, but I don't have a clue what this could be. Are there any good resources out there for figuring out methods might have been used to create this string?
 
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