Abstract
As we are entering the third generation of mobile technology (3G)
the number of services needing security grows larger. To assess if
the security provided by 3G is sufficient, we take a closer look
at the security mechanisms and their building blocks. Within the
3G security environment the Kasumi block cipher plays an important
role in the integrity and confidentiality provided. Thus the
security of Kasumi, the integrity mode ($9) and confidentiality
mode (f8) is vital.
In this thesis the published attacks, the provable security and
the pseudo-randomness of Kasumi are examined in order to consider
whether Kasumi, f8 and f9 are secure. Also described are the
authentication and key agreement example set Milenage and
it's kernel function Rijndael (AES). In addition, background
theory is provided for the reader to better understand the proofs
and cryptanalytic techniques used.
The results of this thesis show no threat to the security of the
Milenage, f8 or f9 functions. The security of Kasumi is also
preserved as it is a family of pseudo-random permutations and
provable secure against linear and differential cryptanalysis.