A new algorithm combining substitution & transposition cipher techniques for secure communication

In today's world of communication, the maintenance of the security, confidentiality and integrity of the data is a big challenge. Cryptography is the technique that contributes to achieve this goal in a communication network. It converts the information into cipher text with the help of an algorithm or cipher text technique. Many such techniques have come into the picture till date such as ceaser cipher, vernam cipher, vigenere cipher technique etc. This paper thus, proposes a new cipher technique which consists of the three step process-substitution, transposition and substitution again. Using this technique, the plain text can be converted into the cipher text which is the combination of various symbols defined in a given table that in turn makes the plain text unpredictable.