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Graphical passwords have been proposed as a possible alternative to text-based schemes, but graphical passwords, in storage and communication, require much more storage space than text based passwords, and network transfer delay is also a concern for them. An idea of "graphical structure plus number theory" (GSPNT) for designing new type of passwords is an alternative to typical graphical...
We design cryptographical graphs for information security by the following principles: (1) be used conveniently in usually; (2) with strong security, that is, it is difficult to be broken; (3) there are enough graphs and labellings for making desired keys and locks. For answering the above problems, we prove the series cryptographical graphs have good properties, and show the guarantee for constructing...
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