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Block ciphers in UMTS

Mathisen, Tor-Erik
Master thesis
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Year
2004
Permanent link
http://urn.nb.no/URN:NBN:no-9886

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  • Institutt for informatikk [3608]
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.
 
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