@inproceedings{be0ef6f9dc96472bb7d20305f4004969,
title = "SafeDSA: Safeguard dynamic spectrum access against fake secondary users",
abstract = "Dynamic spectrum access (DSA) is the key to solving worldwide wireless spectrum shortage. In a DSA system, unlicensed secondary users can opportunistically use a spectrum band when it is not used by the licensed primary user. The open nature of the wireless medium means that any secondary user can freely use any given spectrum band. Secondary-user authentication is thus essential to ensure the proper operations of DSA systems. We propose SafeDSA, a novel PHY-based scheme for authenticating secondary users in DSA systems. In SafeDSA, the secondary user embeds his spectrum-use authorization into the cyclic prefix of each physicallayer symbol, which can be detected and authenticated by a verifier. In contrast to previous work, SafeDSA achieves robust and efficient authentication of secondary users with negligible impact on normal data transmissions. We validate the efficacy and efficiency of SafeDSA through detailed MATLAB simulations and USRP experiments. Our results show that SafeDSA can detect fake secondary users with a maximum false-positive rate of 0.091 and a negligible false-negative rate based on USRP experiments.",
keywords = "Cyclic prefix, Dynamic spectrum access, OFDM, Secondary user authentication",
author = "Xiaocong Jin and Jingchao Sun and Rui Zhang and Yanchao Zhang",
year = "2015",
month = oct,
day = "12",
doi = "10.1145/2810103.2813717",
language = "English (US)",
series = "Proceedings of the ACM Conference on Computer and Communications Security",
publisher = "Association for Computing Machinery",
pages = "304--315",
booktitle = "CCS 2015 - Proceedings of the 22nd ACM SIGSAC Conference on Computer and Communications Security",
note = "22nd ACM SIGSAC Conference on Computer and Communications Security, CCS 2015 ; Conference date: 12-10-2015 Through 16-10-2015",
}