Topological Graphic Passwords Made By Two Sun-graphs On Odd-graceful Labelling

The ring network has the characteristics of fast transmission and high efficiency. We construct series sun-graphs from ring networks. The series sun-graphs have topological graphic passwords (Topsnut-gpws) on odd-graceful labellings, and they can be encrypted by corresponding Topsnut-matrix and Text-based passwords. Ensure the topological graphic passwords of the series sun-graphs are more secure.