Türkçe Karakter Destekli Genişletilmiş Kayan Polybius Karesi ile Şifrelenmiş Veriyi Gömme

Abstract

The security of a message transmitted from one peer to another is a matter of many studies over centuries. Today, with digital communication, billions of data are transmitted from one point to another every milisecond. That is why data security has become one of the most studied topics. In this study, an ancient encryption method called Polybius square which has been a source of inspiration for today's encryption methods is introduced. In addition an expanded version of Polybius square was developed adding Turkish character support. An encryption key has also been added to the Polybius cipher. The entire message can be encrypted with a key or with different keys in each character of the message. The encrypted message is hidden within the pixels of the picture files using the LSB algorithm. Thus, when the message is transmitted to the other side, it is encrypted with a private key, hidden inside a cover data, and has become unsuspicious. To measure the change in cover data; MSE, PSNR and SSIM measurement methods are used. The method proposed in the study is coded with a visual programming language. The developed software has been introduced and its results are shown.

A Modified Polybius Cipher with a New Element-in-Grid Sequencer

“…An extended Polybius Square presented in [15] works by integrating Turkish characters in a 10x7 grid. The extended version also introduced a dynamic matrix wherein elements of a matrix shift values depending on a numeric value.…”

“…Various classical ciphers such as Railfence cipher [13], [14], Polybius square cipher [15]- [19], Playfair cipher [20]- [22], Permutation cipher [23], Homophonic substitution cipher [24], [25], Hill cipher [26], Grille cipher [27], Four-square cipher [23], Enigma machine cipher [23], Caesar cipher [28]- [30], Base64 cipher [31]- [33], Affine cipher [23], [34]- [36], and ADFGVX cipher [23], [37]- [39] to name some, are being incorporated with block ciphers, among others, to solve the constraints in IoT. Among the classical ciphers, the Polybius Cipher, known as the Polybius square, is identified as one of the commonly used methods for such purpose [40]- [42].…”