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Shadow Phone and Ghost SIM: A Step Toward Geolocation Anonymous Calling

Description

Mobile telephony is a critical aspect of our modern society: through telephone calls,

it is possible to reach almost anyone around the globe. However, every mobile telephone

call placed implicitly leaks the

Mobile telephony is a critical aspect of our modern society: through telephone calls,

it is possible to reach almost anyone around the globe. However, every mobile telephone

call placed implicitly leaks the user's location to the telephony service provider (TSP).

This privacy leakage is due to the fundamental nature of mobile telephony calls that

must connect to a local base station to receive service and place calls. Thus, the TSP

can track the physical location of the user for every call that they place. While the

The Internet is similar in this regard, privacy-preserving technologies such as Tor allow

users to connect to websites anonymously (without revealing to their ISP the site

that they are visiting). In this thesis, the scheme presented, called shadow calling,

to allow geolocation anonymous calling from legacy mobile devices. In this way,

the call is placed from the same number, however, the TSP will not know the user's

physical location. The scheme does not require any change on the network side and

can be used on current mobile networks. The scheme implemented is for the GSM

(commonly referred to as 2G) network, as it is the most widely used mode of mobile

telephony communication. The feasibility of our scheme is demonstrated through the

prototype. Shadow calling, which renders the users geolocation anonymous, will be

beneficial for users such as journalists, human rights activists in hostile nations, or

other privacy-demanding users.

Contributors

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Created

Date Created
  • 2017