I cannot disagree enough with the usefulness of renaming perl/curl/wget/tftp. Not only is this looking for trouble on your system stability, but it's pretty useless as you will never be able to enumerate accurately and exhaustively the binaries that could be used against you on your system. It's seriously counter-productive.
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Link to this comment: http://www.securityfocus.com/comments/infocus/1871/633#633