1. Sarah Lysecki, “How secure are one-time passwords(OTPs)”.
2. Raymond J. Sobol, “Portable instantaneous wireless event based photo identification and alerting security system”.
3. Rishav Kumar, “How OTPs can be sniffed”.
4. John M. Burgan, Mohammad Besharat, “Method and system for associating a user profile to a sim card”.
5. Diffie, W., Hellman, M.: Cryptanalysis of the NTRU Signature Scheme (NSS). In: Boyd, C. (ed.) ASIACRYPT 2001. LNCS, vol. 2248, p. 1. Springer, Heidelberg (2001)