Abstract-An increasing number of mobile devices, including smartphones, use WLAN for accessing the Internet. Existing WLAN authentication mechanisms are either disruptive, such as presenting a captive web page prompting for password, or unreliable, enabling a malicious user to attack a part of operator's infrastructure. In this paper, we present a distributed authentication architecture for WLAN users providing instant network access without manual interactions. It supports terminal mobility across WLAN access points with the Host Identity Protocol (HIP), at the same time protecting the operator's infrastructure from external attacks. User data sent over a wireless link is protected by the IPsec ESP protocol. We present our architecture design and implementation experience on two OpenWrt WLAN access points, followed by measurement results of the working prototype. The system is being deployed into pilot use in the city-wide panOULU WLAN.
Abstract-We compare computational resources required for handling control plane of the Host Identity Protocol (HIP) using Rivest-Shamir-Adleman (RSA) versus Elliptic Curve Cryptography (ECC) encryption algorithms with keys of equivalent strength. We show that servers would establish almost three times more HIP connections per second when ECC is used for generating the session key. For devices with low computational power such as Nokia N810 Internet Tablet, the use of ECC would notably reduce the delay to establish a HIP association.Unless compatibility with legacy RSA/DSA-only systems is needed, the Host Identity may be an ECC key as well, but such a modification would bring only 50 percent additional performance with the current default keys. However the situation becomes different under higher security requirements when employing ECC for the host identification boosts the performance more than four times, and we consider ECC Host Identities desirable in that case.
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