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The Universal Mobile Telecommunications System (UMTS) offers panoply of 3G services that require a high protection of the transmitted information. In the present paper, the authors are interested by network access security, especially the protection of the data integrity and the provisioning of data encryption. A special interest will be given to the second set of 3GPP cryptographic algorithms UEA2/UIA2 based on the SNOW 3G algorithm. This set was, in fact, a subject only of few research works in comparison with the first one based on KASUMI algorithm. A closer look is taken at both the encryption algorithm UEA2 and the integrity algorithm UIA2 operations. The different operation modes of the algorithm SNOW 3G will be presented as well.
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