[ubuntu] What "type" of encryption is the default ubuntu home directory one?

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http://ubuntuforums.org – I'm curious to know more about the default ubuntu home folder encryption. I encrypted my drive with the live cd when I was installing ubuntu, and it didn't tell me anything about the encryption scheme! I want to know how many...uh...bits? the encryption has? and the encryption algorithm (the only one I know of is RSA). I'm a bit of a newb at encryption so bear with me. (Hardware)