Hacker cracks code to encrypt mobile calls

A GERMAN computer scientist has cracked the codes used to encrypt calls made from more than 80 per cent of the world’s mobile phones.

Karsten Nohl and his team of 24 hackers began working on the security algorithm for the Global System for Mobiles (GSM) in August.

Developed in 1988, the system prevents the interception of calls by forcing phones and base stations to change frequencies constantly. Most of the UK’s mobile phones use the GSM system and the breach represents a potential threat to the security of mobile phone communication.

Mr Nohl claims that, armed with the code, which has been published online, and a laptop with two network cards, an eavesdropper could be recording phone calls within 15 minutes.

“This shows that existing GSM security is inadequate,” Mr Nohl told the Chaos Communication Congress, an international annual meeting of hackers taking place in Berlin this week.

He insisted he had deciphered the code to force the global telecommunications industry to upgrade its security.

Mr Nohl said important negotiations involving politicians or business leaders could easily be intercepted and they should invest in further encryption software to protect their privacy.

The GSM Association, which represents the interests of the worldwide mobile communications industry, played down the security threat and said Mr Nohl's activity was "highly illegal". – ( Guardianservice)