Research Article
Enhanced Block Playfair Cipher
@INPROCEEDINGS{10.1007/978-3-642-37949-9_60, author={Arvind Kumar and Pawan Mehra and Gagan Gupta and Manika Sharma}, title={Enhanced Block Playfair Cipher}, proceedings={Quality, Reliability, Security and Robustness in Heterogeneous Networks. 9th International Conference, QShine 2013, Greader Noida, India, January 11-12, 2013, Revised Selected Papers}, proceedings_a={QSHINE}, year={2013}, month={7}, keywords={Playfair Cipher Random number Random algorithm Polyalphabetic cipher}, doi={10.1007/978-3-642-37949-9_60} }- Arvind Kumar
Pawan Mehra
Gagan Gupta
Manika Sharma
Year: 2013
Enhanced Block Playfair Cipher
QSHINE
Springer
DOI: 10.1007/978-3-642-37949-9_60
Abstract
In this paper we will enhance the traditional Blick Playfair Cipher by encrypting the plaintext in blocks. For each block the keyword would be the same but the matrix will shift by some random value. As a result of which the diagram analysis would be very difficult which is done in the traditional Playfair Cipher to obtain the plaintext from the cipher text. The shift value will be generated using random algorithm which is very secure. Playfair Cipher method, based on polyalphabetic cipher is relatively easy to break because it still leaves much of the structure and a few hundred of letters of cipher text are sufficient. To add to its security and to make it more usable we are using 6x6 matrix instead of 5x5 which will be able to cover 26 alphabets in English and ten numerals i.e. from 0 to 9. This 6x6 matrix eliminate the case of putting of 2 alphabets (I and J) together in the matrix as it was in the 5x5 matrix. In this approach plaintext as well as key can be numeral, alphabetic or combination of both and a random number will shift the matrix every time.