In this paper, we present a new type of symmetric encryption by converting the classical monoalphabetic affine cipher into a polyalphabetic cipher.The proposed encryption utilizes the properties of outer-convex dominating set in Revenge of the Fallen the corona of graphs to generate random keys from the shared keyword to every character of the message.The new encryption eliminates the weaknesses of affine cipher, thus increasing the Thermal shaping blow dry gelee level of confidence for exchanging messages.