APPLICATIONS OF THE DRAZIN INVERSE TO THE HILL CRYPTOGRAPHIC SYSTEM. PART III.
Robert E. Hartwing, Jack Levine · Cryptologia · 1981
In this part it is shown how the scalar unit coefficient a appearing in the W key formula (see Part I) can be replaced by an invertible matrix coefficient Γ. (A similar discussion with respect to the V key will appear In Part IV.) Various examples illustrate in detail the different procedures involved. Some examples in the encipherment and decipherment calculations are left as problems for the reader. The Appendix contains a proof of the main theorem.