Improving the Control Strategy in two-way deterministic cryptographic protocols
arXiv:1005.1222
Abstract
We introduce a new control strategy on a two-way deterministic cryptographic scheme, which relies on a suitable unitary transformation rather than quantum measurement. The study is developed for d-ary alphabets and the particular choice of the transformation works when d is an odd prime power. It leads to an improvement of the protocol security, which we prove to increase with the alphabet order d.
8 pages, 3 figures