Teaching is making a difference on the lifetime of the learner, making them to be a productive member of the society. The method of teaching is completed during a well organized manner then it can improves the learners constructive, innovative thoughts, inter personal skills and provides ability to guide to future learners. collaborative learning involves the pedagogies of learner in interactive mode and involves the co operation, interaction between the learners. By making the discussion as group wise, by sharing their ideas openly learners present their subject. Collaborative learning enhances co operative nature, communication skills, builds confidence about the topic and therefore the most vital thing is it provides good idea about time management. Students. were participated within the activity in agood interactive way.
In the ancient block Hill cipher, the cipher text is obtained by multiplying the blocks of the plain text with the key matrix. To strengthen the keymatrix, a double guard Hill cipher was proposed with two key matrices, a private key matrix and its modified key matrix along with permutation. In the ancient block Hill cipher, the cipher text is obtained by multiplying the blocks of the plain text with the key matrix. To strengthen the key matrix, a double guard Hill cipher was proposed with two key matrices, a private key matrix and its modified key matrix along with permutation. In this paper a novel modification is performed to the double guard Hill cipher in order to reduce the number of calculation to obtain the cipher text by using non-square matrices. This modified double guard Hill cipher uses a non-square matrix of order (p × q) as its private keymatrix.
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