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The Hill Cipher is a classical symmetric cipher which breaks plaintext intoblocks of size m and then multiplies each block by an m by m key matrix toyield ciphertext. However, it is well known that the Hill cipher succumbs tocryptanalysis relatively easily. As a result, there have been efforts tostrengthen the cipher through the use of various techniques e.g. permuting rowsand columns of the key matrix to encrypt each plaintext vector with a new keymatrix. In this paper, we strengthen the security of the Hill cipher against aknown-plaintext attack by encrypting each plaintext matrix by a variable-lengthkey matrix obtained from a Maximum Distance Separable (MDS) master key matrix.

Variable-length Hill Cipher with MDS Key Matrix