GSM Security

GSM Security. Guide to the security of GSM mobile telephones and GSM networks. Home of the GSM Security FAQ..

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Gsm-security.net news digest

  • 13 years

    Have the A3 and A8 algorithms been broken?

    Most GSM providers use a version of COMP128 for both the A3 authentication algorithm and the A8 key generation algorithm. Ian Goldberg and David Wagner of the University of California at Berkeley demonstrated that all A8 implementations they looked at...

  • 13 years

    Have the A5 algorithms been broken?

    Alex Biryukov, Adi Shamir and David Wagner showed that they can find the A5/1 key in less than a second on a single PC with 128 MB RAM and two 73 GB hard disks, by analyzing the output of the A5/1 algorithm in the first two minutes of the conversation...

  • 13 years

    What Are locking and unlocking?

    Most GSM Mobile Stations (MS) are sold to be used on a specific GSM network. The Mobile Stations are “locked” to only accept a Subscriber Identity Module (SIM) from the GSM carrier that sold the Mobile Station. There are several situations...

  • 13 years

    What is an IMEI?

    The IMEI (International Mobile Equipment Identity) is a unique 17 or 15 digit code used to identify an individual mobile station to a GSM or UMTS network. The IMEI number provides an important function; it uniquely identifies a specific mobile phone...

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