From: Brian Candler <b.candler@...>
Date: 2010-08-18T23:15:57+09:00
Subject: Re: Base64 multiple by 4

Also, I tried to run the code you posted with the decode test vector, 
but it fails because encoding_characters is not defined.

If all you're doing is base64 with some obfuscated character set, then 
String#tr may do what you want.

>> str = "foobar"
=> "foobar"
>> str.tr("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/", "V8yOtbKFR4mIDuwEzP7Mv/TLQSe+qC6aHkolZ50dG2jAUpWxh1J3N9YsBiXrcgfn")
=> "aGG+eA"
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