20.500.12556/RUL-72490 Algoritem COMP128 na kartici SIM The COMP128 algorithm and the SIM card Kartica SIM igra pomembno vlogo pri mobilni komunikaciji. Na kartici SIM je shranjen zasebni ključ uporabnika. Do njega dostopa algoritem COMP128, ki omogoča avtentikacijo uporabnika v mobilno omrežje in generiranje sejnih ključev za šifriranje komunikacij. V diplomskem delu podrobno opišemo algoritem COMP128. Napad nanj izvedemo z grobo silo. Pri tem izkoristimo slabosti v strukturi algoritma COMP128 in paradoks rojstnega dne, kar omogoča rekonstrukcijo zasebnega ključa v realnem času. Napad smo tudi implementirali in preizkusili. V posebnem poglavju predstavimo uporabljene koncepte iz kriptografije. To so avtentikacija, zgoščevalne funkcije in paradoks rojstnega dne. SIM card has an important role in mobile communications. It contains the user's private key, which is used in COMP128 algorithm for user authentication to the mobile network and generating session keys to encrypt communications. In this thesis a detailed description of COMP128 algorithm is presented. A brute force attack on the algorithm is described, which exploits a weakness in the structure of COMP128 algorithm, and is based on birthday paradox. As a result the user's private key can be obtained in real time. The attack on COMP128 algorithm was also implemented and tested. A separate chapter provides the necessary cryptographic concepts such as authentication, hash functions and birthday paradox. algoritem COMP128 avtentikacija kartica SIM kriptografija napad z grobo silo protokol GSM paradoks rojstnega dne COMP128 algorithm authentication SIM card cryptography brute-force attack GSM protocol birthday paradox true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2015-09-24 13:40:10 2015-09-24 13:40:11 2022-08-01 16:04:23 0000-00-00 00:00:00 2015 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1970-01-01 16458 1536612803 Nunar_Anze_-_Algoritem_COMP128_na_kartici_SIM.pdf Nunar_Anze_-_Algoritem_COMP128_na_kartici_SIM.pdf 1 47C29E5C5058A19AB80D5C47CBB16E61 b98b8817adac86e711bd36a415aed8429982261bf3577c8d666c5d1f2fefa222 5fc52577-a1ad-11eb-a523-00155dcfd717 20.500.12556/rul/341df6a2-a51f-4a29-a6ea-0ea7be897b3e https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=72529 Fakulteta za računalništvo in informatiko 0 0 0