RHUL-MA-2001-3

This paper describes the level of security offered by the GSM air
interface protocol.  All known attacks against this protocol are
described, and their feasibility is assessed.  Consideration of the
level of security offered by particular algorithms which may be used
to help implement the protocol are outside the scope of this paper.
The main objectives of the paper are to provide a benchmark against
which the security features of future mobile telecommunications
networks can be judged, and also to help determine the security
requirements for future networks.