Items where Author is "Xu, Ning"

Journal Article

Zhu, Bin B. and Yan, Jeff and Bao, Guanbo and Yang, Maowei and Xu, Ning (2014) Captcha as graphical passwords : a new security primitive based on hard AI problems. IEEE Transactions on Information Forensics and Security, 9 (6): 6775249. pp. 891-904. ISSN 1556-6013

Contribution in Book/Report/Proceedings

Zhu, Bin B. and Yan, Jeff and Li, Qiujie and Yang, Chao and Liu, Jia and Xu, Ning and Yi, Meng and Cai, Kaiwei (2010) Attacks and design of image recognition CAPTCHAs. In: CCS '10 Proceedings of the 17th ACM conference on Computer and communications security :. ACM, New York, pp. 187-200. ISBN 9781450302449