News tagged with codebook

Guide to breaking cell phone security revealed

(AP) -- A German security expert has raised the ire of the cell phone industry after he and a group of researchers posted online a how-to guide for cracking the encryption that keeps the calls of GSM-standard cell phone users ...

dateDec 30, 2009 in Telecom
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Explained: The Shannon limit

It's the early 1980s, and you’re an equipment manufacturer for the fledgling personal-computer market. For years, modems that send data over the telephone lines have been stuck at a maximum rate of 9.6 kilobits ...

dateJan 19, 2010 in Computer Sciences
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How to Measure What We Don't Know

(PhysOrg.com) -- How do we discover new things? For scientists, observation and measurement are the main ways to extract information from Nature. Based on observations, scientists build models that, in turn, are used to make ...

dateSep 10, 2009 in General Physics feature
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