A who’s-who of more than three dozen high-tech and security experts from industry and academia is urging Google to beef up the privacy and security settings of its Gmail, Google Docs and Calendar online services. At issue is whether Google is doing enough to block hackers from hijacking a user’s Webmail account or intercepting information from online documents. An increasing number of free, publicly available tools may make it simple for even novice hackers to launch such attacks. “Google’s default settings put customers at risk unnecessarily. Google’s services protect customers’ usernames and passwords from interception and theft,” said the experts, including luminaries from AT&T, PGP Corp. and top researchers from Berkeley, Harvard, MIT, Oxford and Purdue. “However, when a user composes email, documents, spreadsheets, presentations and calendar plans, this potentially sensitive content is transferred to Google’s servers in the clear, allowing anyone with the right tools to steal that information.