Creating a Secure Infrastructure for Wireless Diagnostics and Software Updates in Vehicles
SAFECOMP '08 Proceedings of the 27th international conference on Computer Safety, Reliability, and Security
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WTLS (Wireless Transport Layer Security) is an importantstandard protocol for secure wireless access to Internetservices. WTLS employs public-key cryptosystems during thehandshake between mobile client and WAP gateway (server).Several cryptosystems at different key strengths can be used inWTLS. The trade-off is security versus processing andtransmission time. In this paper, an analytical performancemodel for public-key cryptosystem operations in WTLS protocolis developed. Different handshake protocols, differentcryptosystems and key sizes are considered. Public-keycryptosystems are implemented using state-of-the-artperformance improvement techniques, yielding actualperformance figures for individual cryptosystems. These figuresand the analytical model are used to calculate the cost of usingpublic-key cryptosystems in WTLS. Results for differentcryptosystems and handshake protocols are comparativelydepicted and interpreted. It has been observed that ECC(Elliptic Curve Cryptography) performs better than its rival RSAcryptosystem in WTLS. Performance of some stronger ECCcurves, which are not considered in WTLS standard, is alsoanalyzed. Results showed that some of those curves could beused in WTLS for high security applications with an acceptabledegradation in performance.