German posts guide to crack GSM code

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 secret.

Karsten Nohl, 28, said he, working with others online and around the world, created a codebook showing how to get past the GSM encryption used to keep conversations on more than 3 billion mobile phones safe from prying ears. Nohl said the purpose was to push companies to improve security. “The message is to have better security, not we want to break you,” he said.

GSM, the leading cell phone technology around the world, is used by several wireless carriers in the US.

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