| Summary: | 碩士 === 國立中興大學 === 電機工程學系 === 93 === We propose a security authentication policy, Dynamic Session Key Policy (DSKP), for a secure handoff between the UMTS and IEEE 802.11 WLAN. This policy is founded and improved from DKEP (Dynamic Key Exchange Protocol). It redeems the confidentiality of the communication association using the asymmetric and symmetric encryption. The exposed data in DSKP are fixed and useless for the enemy. The one time password system is used for the key exchange of the sessions. The transition of the communication states in DSKP are seamless and cannot be personated. From the security analysis using the security requirements of the 3G mobile communication system and the security claims of the IEEE 802.11 WLAN, DSKP can avoid possible attack in wireless circumstance. DSKP is also compared with the EAP-SIM and EAP-AKA, which are used commonly as the authentication protocol in the present WLAN. From our analysis, DSKP gets better security grades.
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