I am building a web interface for webtest and I also need all of the properties that are used in testing to be encrypted. I have the web interface write to the properties file directly, I just need to add decryption to the part of code in webtest that pulls a property from a properties file. The problem is I can't seem to locate where this happens in the webtest code. I have tried a couple times unsuccessfully including changing the implementation of the IPropertyHandler interface in com.canoo.webtest.ant.TestSpecificationTask . Any help would be appreciated.