1. 1. P. Rohatgi, “A Compact and Fast Hybrid Signature Scheme for Multicast Packet Authentication,” in 6th ACM Conference on Computer and Communications Security, New York, NY, USA, 1999, pp. 93–100.
   2. A. K. Das, P. Sharma, S. Chatterjee, and J. K. Sing, “A Dynamic password-based user authentication scheme for Hierarchical wireless sensor networks,” Journal of Network and Computer Applications, vol. 35, no. 5, pp. 1646–1656, 2012.
   3. M. Turkanovi, B. Brume, and M. Holbl, “A novel user Authentication and key agreement scheme for Heterogeneous ad hoc wireless sensor networks, based on The Internet of Things notion,” Ad Hoc Networks, vol. 20, pp. 96 – 112, 2014.
   4. Secure Hash Standard, FIPS PUB 180-1, and National Institute of Standards and Technology (NIST), U.S. Department of Commerce, April 1995