In this computer and internet based modern era, people have to deal with private information in thousands way. Today’s prime concern is to keep secure the information of different channel and medium related to one’s and to communicate securely, and to do so cryptography method is the sole key to it. This research paper will briefly lighten on the history of cryptography, basic definitions related to cryptography and some basic theorems to build different types of cryptography models. This research paper will propose few propositions based on solvability equation and will introduce a solvability series. From ancient time to now there are several cryptographic models are invented. This research paper will present a new type of complete model of cryptography with the help of a modified solvability proposition and solvability series, different from others.
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